organized_contracts/30/301395990f4bc8f1ec002a75f121bb94ace4dbb9e8b21bbacfb5cdcf0a8e882c/main.sol

// This contract is part of Zellic’s smart contract dataset, which is a collection of publicly available contract code gathered as of March 2023.

// SPDX-License-Identifier: MIT     

pragma solidity ^0.8.0;
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

pragma solidity ^0.8.0;
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    constructor() {
        _transferOwnership(_msgSender());
    }

    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    function owner() public view virtual returns (address) {
        return _owner;
    }

    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }


    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

pragma solidity ^0.8.0;

abstract contract ReentrancyGuard {

    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    modifier nonReentrant() {
        
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        _status = _ENTERED;

        _;

        _status = _NOT_ENTERED;
    }
}

pragma solidity ^0.8.0;

library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    function toString(uint256 value) internal pure returns (string memory) {

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }
}

pragma solidity ^0.8.0;


library EnumerableSet {


    struct Set {
        // Storage of set values
        bytes32[] _values;

        mapping(bytes32 => uint256) _indexes;
    }

    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);

            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    function _remove(Set storage set, bytes32 value) private returns (bool) {

        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) {

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            if (lastIndex != toDeleteIndex) {
                bytes32 lastValue = set._values[lastIndex];

                set._values[toDeleteIndex] = lastValue;
                
                set._indexes[lastValue] = valueIndex; 
            }

            set._values.pop();

            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        return set._values[index];
    }

    function _values(Set storage set) private view returns (bytes32[] memory) {
        return set._values;
    }

    struct Bytes32Set {
        Set _inner;
    }

    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }

    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }

    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }

    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, index);
    }

    function values(Bytes32Set storage set) internal view returns (bytes32[] memory) {
        return _values(set._inner);
    }

    struct AddressSet {
        Set _inner;
    }

    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(uint160(value))));
    }

    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(uint160(value))));
    }

    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(uint160(value))));
    }

    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint160(uint256(_at(set._inner, index))));
    }

    function values(AddressSet storage set) internal view returns (address[] memory) {
        bytes32[] memory store = _values(set._inner);
        address[] memory result;

        assembly {
            result := store
        }

        return result;
    }

    struct UintSet {
        Set _inner;
    }

    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }

    function values(UintSet storage set) internal view returns (uint256[] memory) {
        bytes32[] memory store = _values(set._inner);
        uint256[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }
}

pragma solidity ^0.8.4;

interface IERC721A {

    error ApprovalCallerNotOwnerNorApproved();

    error ApprovalQueryForNonexistentToken();

    error BalanceQueryForZeroAddress();

    error MintToZeroAddress();

    error MintZeroQuantity();

    error OwnerQueryForNonexistentToken();

    error TransferCallerNotOwnerNorApproved();

    error TransferFromIncorrectOwner();

    error TransferToNonERC721ReceiverImplementer();

    error TransferToZeroAddress();

    error URIQueryForNonexistentToken();

    error MintERC2309QuantityExceedsLimit();

    error OwnershipNotInitializedForExtraData();

    struct TokenOwnership {

        address addr;

        uint64 startTimestamp;

        bool burned;

        uint24 extraData;
    }

    function totalSupply() external view returns (uint256);

    function supportsInterface(bytes4 interfaceId) external view returns (bool);

    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    function balanceOf(address owner) external view returns (uint256 balance);

    function ownerOf(uint256 tokenId) external view returns (address owner);

    function safeTransferFrom(

        address from,

        address to,

        uint256 tokenId,

        bytes calldata data

    ) external payable;

    function safeTransferFrom(

        address from,

        address to,

        uint256 tokenId

    ) external payable;

    function transferFrom(

        address from,

        address to,

        uint256 tokenId

    ) external payable;

    function approve(address to, uint256 tokenId) external payable;

    function setApprovalForAll(address operator, bool _approved) external;

    function getApproved(uint256 tokenId) external view returns (address operator);

    function isApprovedForAll(address owner, address operator) external view returns (bool);

    function name() external view returns (string memory);

    function symbol() external view returns (string memory);

    function tokenURI(uint256 tokenId) external view returns (string memory);

    event ConsecutiveTransfer(uint256 indexed fromTokenId, uint256 toTokenId, address indexed from, address indexed to);
}

pragma solidity ^0.8.4;

interface ERC721A__IERC721Receiver {
    function onERC721Received(

        address operator,

        address from,

        uint256 tokenId,

        bytes calldata data

    ) external returns (bytes4);
}

contract ERC721A is IERC721A {

    struct TokenApprovalRef {
        address value;
    }

    uint256 private constant _BITMASK_ADDRESS_DATA_ENTRY = (1 << 64) - 1;

    uint256 private constant _BITPOS_NUMBER_MINTED = 64;

    uint256 private constant _BITPOS_NUMBER_BURNED = 128;

    uint256 private constant _BITPOS_AUX = 192;

    uint256 private constant _BITMASK_AUX_COMPLEMENT = (1 << 192) - 1;

    uint256 private constant _BITPOS_START_TIMESTAMP = 160;

    uint256 private constant _BITMASK_BURNED = 1 << 224;

    uint256 private constant _BITPOS_NEXT_INITIALIZED = 225;

    uint256 private constant _BITMASK_NEXT_INITIALIZED = 1 << 225;

    uint256 private constant _BITPOS_EXTRA_DATA = 232;

    uint256 private constant _BITMASK_EXTRA_DATA_COMPLEMENT = (1 << 232) - 1;

    uint256 private constant _BITMASK_ADDRESS = (1 << 160) - 1;

    uint256 private constant _MAX_MINT_ERC2309_QUANTITY_LIMIT = 5000;

    bytes32 private constant _TRANSFER_EVENT_SIGNATURE =
        0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef;

    uint256 private _currentIndex;

    uint256 private _burnCounter;

    string private _name;

    string private _symbol;

    mapping(uint256 => uint256) private _packedOwnerships;

    mapping(address => uint256) private _packedAddressData;

    mapping(uint256 => TokenApprovalRef) private _tokenApprovals;

    mapping(address => mapping(address => bool)) private _operatorApprovals;

    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
        _currentIndex = _startTokenId();
    }

    function _startTokenId() internal view virtual returns (uint256) {
        return 0;
    }

    function _nextTokenId() internal view virtual returns (uint256) {
        return _currentIndex;
    }

    function totalSupply() public view virtual override returns (uint256) {

        unchecked {
            return _currentIndex - _burnCounter - _startTokenId();
        }
    }

    function _totalMinted() internal view virtual returns (uint256) {

        unchecked {
            return _currentIndex - _startTokenId();
        }
    }

    function _totalBurned() internal view virtual returns (uint256) {
        return _burnCounter;
    }

    function balanceOf(address owner) public view virtual override returns (uint256) {
        if (owner == address(0)) revert BalanceQueryForZeroAddress();
        return _packedAddressData[owner] & _BITMASK_ADDRESS_DATA_ENTRY;
    }

    function _numberMinted(address owner) internal view returns (uint256) {
        return (_packedAddressData[owner] >> _BITPOS_NUMBER_MINTED) & _BITMASK_ADDRESS_DATA_ENTRY;
    }

    function _numberBurned(address owner) internal view returns (uint256) {
        return (_packedAddressData[owner] >> _BITPOS_NUMBER_BURNED) & _BITMASK_ADDRESS_DATA_ENTRY;
    }

    function _getAux(address owner) internal view returns (uint64) {
        return uint64(_packedAddressData[owner] >> _BITPOS_AUX);
    }

    function _setAux(address owner, uint64 aux) internal virtual {
        uint256 packed = _packedAddressData[owner];
        uint256 auxCasted;
        // Cast `aux` with assembly to avoid redundant masking.
        assembly {
            auxCasted := aux
        }
        packed = (packed & _BITMASK_AUX_COMPLEMENT) | (auxCasted << _BITPOS_AUX);

        _packedAddressData[owner] = packed;

    }





    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {



        return

            interfaceId == 0x01ffc9a7 || 

            interfaceId == 0x80ac58cd || 

            interfaceId == 0x5b5e139f; 

    }



    function name() public view virtual override returns (string memory) {

        return _name;

    }



    function symbol() public view virtual override returns (string memory) {

        return _symbol;

    }



    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {

        if (!_exists(tokenId)) revert URIQueryForNonexistentToken();



        string memory baseURI = _baseURI();

        return bytes(baseURI).length != 0 ? string(abi.encodePacked(baseURI, _toString(tokenId))) : '';

    }



    function _baseURI() internal view virtual returns (string memory) {

        return '';

    }



    function ownerOf(uint256 tokenId) public view virtual override returns (address) {

        return address(uint160(_packedOwnershipOf(tokenId)));

    }



    function _ownershipOf(uint256 tokenId) internal view virtual returns (TokenOwnership memory) {

        return _unpackedOwnership(_packedOwnershipOf(tokenId));

    }



    function _ownershipAt(uint256 index) internal view virtual returns (TokenOwnership memory) {

        return _unpackedOwnership(_packedOwnerships[index]);

    }



    function _initializeOwnershipAt(uint256 index) internal virtual {

        if (_packedOwnerships[index] == 0) {

            _packedOwnerships[index] = _packedOwnershipOf(index);

        }

    }



    function _packedOwnershipOf(uint256 tokenId) private view returns (uint256) {

        uint256 curr = tokenId;



        unchecked {

            if (_startTokenId() <= curr)

                if (curr < _currentIndex) {

                    uint256 packed = _packedOwnerships[curr];



                    if (packed & _BITMASK_BURNED == 0) {



                        while (packed == 0) {

                            packed = _packedOwnerships[--curr];

                        }

                        return packed;

                    }

                }

        }

        revert OwnerQueryForNonexistentToken();

    }



    function _unpackedOwnership(uint256 packed) private pure returns (TokenOwnership memory ownership) {

        ownership.addr = address(uint160(packed));

        ownership.startTimestamp = uint64(packed >> _BITPOS_START_TIMESTAMP);

        ownership.burned = packed & _BITMASK_BURNED != 0;

        ownership.extraData = uint24(packed >> _BITPOS_EXTRA_DATA);

    }



    function _packOwnershipData(address owner, uint256 flags) private view returns (uint256 result) {

        assembly {

            // Mask `owner` to the lower 160 bits, in case the upper bits somehow aren't clean.

            owner := and(owner, _BITMASK_ADDRESS)

            // `owner | (block.timestamp << _BITPOS_START_TIMESTAMP) | flags`.

            result := or(owner, or(shl(_BITPOS_START_TIMESTAMP, timestamp()), flags))

        }

    }



    function _nextInitializedFlag(uint256 quantity) private pure returns (uint256 result) {

        // For branchless setting of the `nextInitialized` flag.

        assembly {

            // `(quantity == 1) << _BITPOS_NEXT_INITIALIZED`.

            result := shl(_BITPOS_NEXT_INITIALIZED, eq(quantity, 1))

        }

    }



    function approve(address to, uint256 tokenId) public payable virtual override {

        address owner = ownerOf(tokenId);



        if (_msgSenderERC721A() != owner)

            if (!isApprovedForAll(owner, _msgSenderERC721A())) {

                revert ApprovalCallerNotOwnerNorApproved();

            }



        _tokenApprovals[tokenId].value = to;

        emit Approval(owner, to, tokenId);

    }



    function getApproved(uint256 tokenId) public view virtual override returns (address) {

        if (!_exists(tokenId)) revert ApprovalQueryForNonexistentToken();



        return _tokenApprovals[tokenId].value;

    }



    function setApprovalForAll(address operator, bool approved) public virtual override {

        _operatorApprovals[_msgSenderERC721A()][operator] = approved;

        emit ApprovalForAll(_msgSenderERC721A(), operator, approved);

    }



    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {

        return _operatorApprovals[owner][operator];

    }



    function _exists(uint256 tokenId) internal view virtual returns (bool) {

        return

            _startTokenId() <= tokenId &&

            tokenId < _currentIndex && // If within bounds,

            _packedOwnerships[tokenId] & _BITMASK_BURNED == 0; // and not burned.

    }



    function _isSenderApprovedOrOwner(

        address approvedAddress,

        address owner,

        address msgSender

    ) private pure returns (bool result) {

        assembly {



            owner := and(owner, _BITMASK_ADDRESS)



            msgSender := and(msgSender, _BITMASK_ADDRESS)



            result := or(eq(msgSender, owner), eq(msgSender, approvedAddress))

        }

    }



    function _getApprovedSlotAndAddress(uint256 tokenId)

        private

        view

        returns (uint256 approvedAddressSlot, address approvedAddress)

    {

        TokenApprovalRef storage tokenApproval = _tokenApprovals[tokenId];



        assembly {

            approvedAddressSlot := tokenApproval.slot

            approvedAddress := sload(approvedAddressSlot)

        }

    }



    function transferFrom(

        address from,

        address to,

        uint256 tokenId

    ) public payable virtual override {

        uint256 prevOwnershipPacked = _packedOwnershipOf(tokenId);



        if (address(uint160(prevOwnershipPacked)) != from) revert TransferFromIncorrectOwner();



        (uint256 approvedAddressSlot, address approvedAddress) = _getApprovedSlotAndAddress(tokenId);



        if (!_isSenderApprovedOrOwner(approvedAddress, from, _msgSenderERC721A()))

            if (!isApprovedForAll(from, _msgSenderERC721A())) revert TransferCallerNotOwnerNorApproved();



        if (to == address(0)) revert TransferToZeroAddress();



        _beforeTokenTransfers(from, to, tokenId, 1);



        assembly {

            if approvedAddress {



                sstore(approvedAddressSlot, 0)

            }

        }



        unchecked {



            --_packedAddressData[from]; 

            ++_packedAddressData[to]; 



            _packedOwnerships[tokenId] = _packOwnershipData(

                to,

                _BITMASK_NEXT_INITIALIZED | _nextExtraData(from, to, prevOwnershipPacked)

            );



            if (prevOwnershipPacked & _BITMASK_NEXT_INITIALIZED == 0) {

                uint256 nextTokenId = tokenId + 1;



                if (_packedOwnerships[nextTokenId] == 0) {



                    if (nextTokenId != _currentIndex) {



                        _packedOwnerships[nextTokenId] = prevOwnershipPacked;

                    }

                }

            }

        }



        emit Transfer(from, to, tokenId);

        _afterTokenTransfers(from, to, tokenId, 1);

    }



    function safeTransferFrom(

        address from,

        address to,

        uint256 tokenId

    ) public payable virtual override {

        safeTransferFrom(from, to, tokenId, '');

    }



    function safeTransferFrom(

        address from,

        address to,

        uint256 tokenId,

        bytes memory _data

    ) public payable virtual override {

        transferFrom(from, to, tokenId);

        if (to.code.length != 0)

            if (!_checkContractOnERC721Received(from, to, tokenId, _data)) {

                revert TransferToNonERC721ReceiverImplementer();

            }

    }



    function _beforeTokenTransfers(

        address from,

        address to,

        uint256 startTokenId,

        uint256 quantity

    ) internal virtual {}



    function _afterTokenTransfers(

        address from,

        address to,

        uint256 startTokenId,

        uint256 quantity

    ) internal virtual {}



    function _checkContractOnERC721Received(

        address from,

        address to,

        uint256 tokenId,

        bytes memory _data

    ) private returns (bool) {

        try ERC721A__IERC721Receiver(to).onERC721Received(_msgSenderERC721A(), from, tokenId, _data) returns (

            bytes4 retval

        ) {

            return retval == ERC721A__IERC721Receiver(to).onERC721Received.selector;

        } catch (bytes memory reason) {

            if (reason.length == 0) {

                revert TransferToNonERC721ReceiverImplementer();

            } else {

                assembly {

                    revert(add(32, reason), mload(reason))

                }

            }

        }

    }



    function _mint(address to, uint256 quantity) internal virtual {

        uint256 startTokenId = _currentIndex;

        if (quantity == 0) revert MintZeroQuantity();



        _beforeTokenTransfers(address(0), to, startTokenId, quantity);



        unchecked {



            _packedAddressData[to] += quantity * ((1 << _BITPOS_NUMBER_MINTED) | 1);



            _packedOwnerships[startTokenId] = _packOwnershipData(

                to,

                _nextInitializedFlag(quantity) | _nextExtraData(address(0), to, 0)

            );



            uint256 toMasked;

            uint256 end = startTokenId + quantity;



            assembly {



                toMasked := and(to, _BITMASK_ADDRESS)



                log4(

                    0, 

                    0, 

                    _TRANSFER_EVENT_SIGNATURE, 

                    0, 

                    toMasked, 

                    startTokenId 

                )



                for {

                    let tokenId := add(startTokenId, 1)

                } iszero(eq(tokenId, end)) {

                    tokenId := add(tokenId, 1)

                } {



                    log4(0, 0, _TRANSFER_EVENT_SIGNATURE, 0, toMasked, tokenId)

                }

            }

            if (toMasked == 0) revert MintToZeroAddress();



            _currentIndex = end;

        }

        _afterTokenTransfers(address(0), to, startTokenId, quantity);

    }



    function _mintERC2309(address to, uint256 quantity) internal virtual {

        uint256 startTokenId = _currentIndex;

        if (to == address(0)) revert MintToZeroAddress();

        if (quantity == 0) revert MintZeroQuantity();

        if (quantity > _MAX_MINT_ERC2309_QUANTITY_LIMIT) revert MintERC2309QuantityExceedsLimit();



        _beforeTokenTransfers(address(0), to, startTokenId, quantity);



        unchecked {



            _packedAddressData[to] += quantity * ((1 << _BITPOS_NUMBER_MINTED) | 1);



            _packedOwnerships[startTokenId] = _packOwnershipData(

                to,

                _nextInitializedFlag(quantity) | _nextExtraData(address(0), to, 0)

            );



            emit ConsecutiveTransfer(startTokenId, startTokenId + quantity - 1, address(0), to);



            _currentIndex = startTokenId + quantity;

        }

        _afterTokenTransfers(address(0), to, startTokenId, quantity);

    }



    function _safeMint(

        address to,

        uint256 quantity,

        bytes memory _data

    ) internal virtual {

        _mint(to, quantity);



        unchecked {

            if (to.code.length != 0) {

                uint256 end = _currentIndex;

                uint256 index = end - quantity;

                do {

                    if (!_checkContractOnERC721Received(address(0), to, index++, _data)) {

                        revert TransferToNonERC721ReceiverImplementer();

                    }

                } while (index < end);

                // Reentrancy protection.

                if (_currentIndex != end) revert();

            }

        }

    }



    function _safeMint(address to, uint256 quantity) internal virtual {

        _safeMint(to, quantity, '');

    }



    function _burn(uint256 tokenId) internal virtual {

        _burn(tokenId, false);

    }



    function _burn(uint256 tokenId, bool approvalCheck) internal virtual {

        uint256 prevOwnershipPacked = _packedOwnershipOf(tokenId);



        address from = address(uint160(prevOwnershipPacked));



        (uint256 approvedAddressSlot, address approvedAddress) = _getApprovedSlotAndAddress(tokenId);



        if (approvalCheck) {

            

            if (!_isSenderApprovedOrOwner(approvedAddress, from, _msgSenderERC721A()))

                if (!isApprovedForAll(from, _msgSenderERC721A())) revert TransferCallerNotOwnerNorApproved();

        }



        _beforeTokenTransfers(from, address(0), tokenId, 1);



        assembly {

            if approvedAddress {

                

                sstore(approvedAddressSlot, 0)

            }

        }



        unchecked {



            _packedAddressData[from] += (1 << _BITPOS_NUMBER_BURNED) - 1;



            _packedOwnerships[tokenId] = _packOwnershipData(

                from,

                (_BITMASK_BURNED | _BITMASK_NEXT_INITIALIZED) | _nextExtraData(from, address(0), prevOwnershipPacked)

            );



            if (prevOwnershipPacked & _BITMASK_NEXT_INITIALIZED == 0) {

                uint256 nextTokenId = tokenId + 1;



                if (_packedOwnerships[nextTokenId] == 0) {



                    if (nextTokenId != _currentIndex) {



                        _packedOwnerships[nextTokenId] = prevOwnershipPacked;

                    }

                }

            }

        }



        emit Transfer(from, address(0), tokenId);

        _afterTokenTransfers(from, address(0), tokenId, 1);



        unchecked {

            _burnCounter++;

        }

    }



    function _setExtraDataAt(uint256 index, uint24 extraData) internal virtual {

        uint256 packed = _packedOwnerships[index];

        if (packed == 0) revert OwnershipNotInitializedForExtraData();

        uint256 extraDataCasted;

        assembly {

            extraDataCasted := extraData

        }

        packed = (packed & _BITMASK_EXTRA_DATA_COMPLEMENT) | (extraDataCasted << _BITPOS_EXTRA_DATA);

        _packedOwnerships[index] = packed;

    }



    function _extraData(

        address from,

        address to,

        uint24 previousExtraData

    ) internal view virtual returns (uint24) {}



    function _nextExtraData(

        address from,

        address to,

        uint256 prevOwnershipPacked

    ) private view returns (uint256) {

        uint24 extraData = uint24(prevOwnershipPacked >> _BITPOS_EXTRA_DATA);

        return uint256(_extraData(from, to, extraData)) << _BITPOS_EXTRA_DATA;

    }



    function _msgSenderERC721A() internal view virtual returns (address) {

        return msg.sender;

    }



    function _toString(uint256 value) internal pure virtual returns (string memory str) {

        assembly {



            let m := add(mload(0x40), 0xa0)



            mstore(0x40, m)



            str := sub(m, 0x20)



            mstore(str, 0)



            let end := str



            for { let temp := value } 1 {} {

                str := sub(str, 1)



                mstore8(str, add(48, mod(temp, 10)))



                temp := div(temp, 10)



                if iszero(temp) { break }

            }



            let length := sub(end, str)



            str := sub(str, 0x20)



            mstore(str, length)

        }

    }

}



pragma solidity ^0.8.13;



contract OperatorFilterer {

    error OperatorNotAllowed(address operator);



    IOperatorFilterRegistry constant operatorFilterRegistry =

        IOperatorFilterRegistry(0x000000000000AAeB6D7670E522A718067333cd4E);



    constructor(address subscriptionOrRegistrantToCopy, bool subscribe) {



        if (address(operatorFilterRegistry).code.length > 0) {

            if (subscribe) {

                operatorFilterRegistry.registerAndSubscribe(address(this), subscriptionOrRegistrantToCopy);

            } else {

                if (subscriptionOrRegistrantToCopy != address(0)) {

                    operatorFilterRegistry.registerAndCopyEntries(address(this), subscriptionOrRegistrantToCopy);

                } else {

                    operatorFilterRegistry.register(address(this));

                }

            }

        }

    }



    modifier onlyAllowedOperator() virtual {



        if (address(operatorFilterRegistry).code.length > 0) {

            if (!operatorFilterRegistry.isOperatorAllowed(address(this), msg.sender)) {

                revert OperatorNotAllowed(msg.sender);

            }

        }

        _;

    }

}



pragma solidity ^0.8.13;



contract DefaultOperatorFilterer is OperatorFilterer {

    address constant DEFAULT_SUBSCRIPTION = address(0x3cc6CddA760b79bAfa08dF41ECFA224f810dCeB6);



    constructor() OperatorFilterer(DEFAULT_SUBSCRIPTION, true) {}

}



pragma solidity ^0.8.13;



interface IOperatorFilterRegistry {

    function isOperatorAllowed(address registrant, address operator) external returns (bool);

    function register(address registrant) external;

    function registerAndSubscribe(address registrant, address subscription) external;

    function registerAndCopyEntries(address registrant, address registrantToCopy) external;

    function updateOperator(address registrant, address operator, bool filtered) external;

    function updateOperators(address registrant, address[] calldata operators, bool filtered) external;

    function updateCodeHash(address registrant, bytes32 codehash, bool filtered) external;

    function updateCodeHashes(address registrant, bytes32[] calldata codeHashes, bool filtered) external;

    function subscribe(address registrant, address registrantToSubscribe) external;

    function unsubscribe(address registrant, bool copyExistingEntries) external;

    function subscriptionOf(address addr) external returns (address registrant);

    function subscribers(address registrant) external returns (address[] memory);

    function subscriberAt(address registrant, uint256 index) external returns (address);

    function copyEntriesOf(address registrant, address registrantToCopy) external;

    function isOperatorFiltered(address registrant, address operator) external returns (bool);

    function isCodeHashOfFiltered(address registrant, address operatorWithCode) external returns (bool);

    function isCodeHashFiltered(address registrant, bytes32 codeHash) external returns (bool);

    function filteredOperators(address addr) external returns (address[] memory);

    function filteredCodeHashes(address addr) external returns (bytes32[] memory);

    function filteredOperatorAt(address registrant, uint256 index) external returns (address);

    function filteredCodeHashAt(address registrant, uint256 index) external returns (bytes32);

    function isRegistered(address addr) external returns (bool);

    function codeHashOf(address addr) external returns (bytes32);

}



pragma solidity ^0.8.4;



interface IERC721ABurnable is IERC721A {



    function burn(uint256 tokenId) external;

}



pragma solidity ^0.8.4;

abstract contract ERC721ABurnable is ERC721A, IERC721ABurnable {

    function burn(uint256 tokenId) public virtual override {

        _burn(tokenId, true);

    }

}





pragma solidity ^0.8.16;

contract Kitties is Ownable, ERC721A, ReentrancyGuard, ERC721ABurnable, DefaultOperatorFilterer{

string public CONTRACT_URI = "";

mapping(address => uint) public userHasMinted;
bool public REVEALED;
string public UNREVEALED_URI = "";
string public BASE_URI = "";
bool public isPublicMintEnabled = false;
uint public COLLECTION_SIZE = 4444; 
uint public MINT_PRICE = 0.0025 ether; 
uint public MAX_BATCH_SIZE = 25;
uint public SUPPLY_PER_WALLET = 25;
uint public FREE_SUPPLY_PER_WALLET = 1;
constructor() ERC721A("Racing Kitties", "KITTY") {}


    function MintVIP(uint256 quantity, address receiver) public onlyOwner {
        require(
            totalSupply() + quantity <= COLLECTION_SIZE,
            "No more Kitties in stock!"
        );
        
        _safeMint(receiver, quantity);
    }

    modifier callerIsUser() {
        require(tx.origin == msg.sender, "The caller is another contract");
        _;
    }

    function getPrice(uint quantity) public view returns(uint){
        uint price;
        uint free = FREE_SUPPLY_PER_WALLET - userHasMinted[msg.sender];
        if (quantity >= free) {
            price = (MINT_PRICE) * (quantity - free);
        } else {
            price = 0;
        }
        return price;
    }

    function mint(uint quantity)
        external
        payable
        callerIsUser 
        nonReentrant
    {
        uint price;
        uint free = FREE_SUPPLY_PER_WALLET - userHasMinted[msg.sender];
        if (quantity >= free) {
            price = (MINT_PRICE) * (quantity - free);
            userHasMinted[msg.sender] = userHasMinted[msg.sender] + free;
        } else {
            price = 0;
            userHasMinted[msg.sender] = userHasMinted[msg.sender] + quantity;
        }

        require(isPublicMintEnabled, "Mint not ready yet!");
        require(totalSupply() + quantity <= COLLECTION_SIZE, "No more left!");

        require(balanceOf(msg.sender) + quantity <= SUPPLY_PER_WALLET, "Tried to mint over over limit");

        require(quantity <= MAX_BATCH_SIZE, "Tried to mint over limit, retry with reduced quantity");
        require(msg.value >= price, "Must send more money!");

        _safeMint(msg.sender, quantity);

        if (msg.value > price) {
            payable(msg.sender).transfer(msg.value - price);
        }
    }
    function setPublicMintEnabled() public onlyOwner {
        isPublicMintEnabled = !isPublicMintEnabled;
    }

    function withdrawFunds() external onlyOwner nonReentrant {
        (bool success, ) = msg.sender.call{value: address(this).balance}("");
        require(success, "Transfer failed.");
    }

    function CollectionUrI(bool _revealed, string memory _baseURI) public onlyOwner {
        BASE_URI = _baseURI;
        REVEALED = _revealed;
    }

    function contractURI() public view returns (string memory) {
        return CONTRACT_URI;
    }

    function setContract(string memory _contractURI) public onlyOwner {
        CONTRACT_URI = _contractURI;
    }

    function ChangeCollectionSupply(uint256 _new) external onlyOwner {
        COLLECTION_SIZE = _new;
    }

    function ChangePrice(uint256 _newPrice) external onlyOwner {
        MINT_PRICE = _newPrice;
    }

    function ChangeFreePerWallet(uint256 _new) external onlyOwner {
        FREE_SUPPLY_PER_WALLET = _new;
    }

    function ChangeSupplyPerWallet(uint256 _new) external onlyOwner {
        SUPPLY_PER_WALLET = _new;
    }

    function SetMaxBatchSize(uint256 _new) external onlyOwner {
        MAX_BATCH_SIZE = _new;
    }

    function transferFrom(address from, address to, uint256 tokenId) public payable override (ERC721A, IERC721A) onlyAllowedOperator {
        super.transferFrom(from, to, tokenId);
    }

    function safeTransferFrom(address from, address to, uint256 tokenId) public payable override (ERC721A, IERC721A) onlyAllowedOperator {
        super.safeTransferFrom(from, to, tokenId);
    }

    function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory data)
        public payable
        override (ERC721A, IERC721A)
        onlyAllowedOperator
    {
        super.safeTransferFrom(from, to, tokenId, data);
    }

    function tokenURI(uint256 _tokenId)
        public
        view
        override (ERC721A, IERC721A)
        returns (string memory)
    {
        if (REVEALED) {
            return
                string(abi.encodePacked(BASE_URI, Strings.toString(_tokenId)));
        } else {
            return UNREVEALED_URI;
        }
    }

}