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{
"language": "Solidity",
"sources": {
"contracts/LPContract.sol": {
"content": "// SPDX-License-Identifier: MIT\r\n\r\n// File @openzeppelin/contracts/token/ERC20/[email protected]\r\n\r\n\r\n\r\npragma solidity ^0.8.7;\r\n\r\n\r\n/**\r\n * @dev Interface of the ERC20 standard as defined in the EIP.\r\n */\r\ninterface IERC20 {\r\n /**\r\n * @dev Returns the amount of tokens in existence.\r\n */\r\n function totalSupply() external view returns (uint256);\r\n\r\n /**\r\n * @dev Returns the amount of tokens owned by `account`.\r\n */\r\n function balanceOf(address account) external view returns (uint256);\r\n\r\n /**\r\n * @dev Moves `amount` tokens from the caller's account to `recipient`.\r\n *\r\n * Returns a boolean value indicating whether the operation succeeded.\r\n *\r\n * Emits a {Transfer} event.\r\n */\r\n function transfer(address recipient, uint256 amount) external returns (bool);\r\n\r\n /**\r\n * @dev Returns the remaining number of tokens that `spender` will be\r\n * allowed to spend on behalf of `owner` through {transferFrom}. This is\r\n * zero by default.\r\n *\r\n * This value changes when {approve} or {transferFrom} are called.\r\n */\r\n function allowance(address owner, address spender) external view returns (uint256);\r\n\r\n /**\r\n * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.\r\n *\r\n * Returns a boolean value indicating whether the operation succeeded.\r\n *\r\n * IMPORTANT: Beware that changing an allowance with this method brings the risk\r\n * that someone may use both the old and the new allowance by unfortunate\r\n * transaction ordering. One possible solution to mitigate this race\r\n * condition is to first reduce the spender's allowance to 0 and set the\r\n * desired value afterwards:\r\n * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\r\n *\r\n * Emits an {Approval} event.\r\n */\r\n function approve(address spender, uint256 amount) external returns (bool);\r\n\r\n /**\r\n * @dev Moves `amount` tokens from `sender` to `recipient` using the\r\n * allowance mechanism. `amount` is then deducted from the caller's\r\n * allowance.\r\n *\r\n * Returns a boolean value indicating whether the operation succeeded.\r\n *\r\n * Emits a {Transfer} event.\r\n */\r\n function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);\r\n\r\n /**\r\n * @dev Emitted when `value` tokens are moved from one account (`from`) to\r\n * another (`to`).\r\n *\r\n * Note that `value` may be zero.\r\n */\r\n event Transfer(address indexed from, address indexed to, uint256 value);\r\n\r\n /**\r\n * @dev Emitted when the allowance of a `spender` for an `owner` is set by\r\n * a call to {approve}. `value` is the new allowance.\r\n */\r\n event Approval(address indexed owner, address indexed spender, uint256 value);\r\n}\r\n\r\n\r\n// File @openzeppelin/contracts/math/[email protected]\r\n\r\n\r\n\r\npragma solidity ^0.8.7;\r\n\r\n\r\n/**\r\n * @dev Wrappers over Solidity's arithmetic operations with added overflow\r\n * checks.\r\n *\r\n * Arithmetic operations in Solidity wrap on overflow. This can easily result\r\n * in bugs, because programmers usually assume that an overflow raises an\r\n * error, which is the standard behavior in high level programming languages.\r\n * `SafeMath` restores this intuition by reverting the transaction when an\r\n * operation overflows.\r\n *\r\n * Using this library instead of the unchecked operations eliminates an entire\r\n * class of bugs, so it's recommended to use it always.\r\n */\r\nlibrary SafeMath {\r\n /**\r\n * @dev Returns the addition of two unsigned integers, with an overflow flag.\r\n *\r\n * _Available since v3.4._\r\n */\r\n function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {\r\n uint256 c = a + b;\r\n if (c < a) return (false, 0);\r\n return (true, c);\r\n }\r\n\r\n /**\r\n * @dev Returns the substraction of two unsigned integers, with an overflow flag.\r\n *\r\n * _Available since v3.4._\r\n */\r\n function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {\r\n if (b > a) return (false, 0);\r\n return (true, a - b);\r\n }\r\n\r\n /**\r\n * @dev Returns the multiplication of two unsigned integers, with an overflow flag.\r\n *\r\n * _Available since v3.4._\r\n */\r\n function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {\r\n // Gas optimization: this is cheaper than requiring 'a' not being zero, but the\r\n // benefit is lost if 'b' is also tested.\r\n // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522\r\n if (a == 0) return (true, 0);\r\n uint256 c = a * b;\r\n if (c / a != b) return (false, 0);\r\n return (true, c);\r\n }\r\n\r\n /**\r\n * @dev Returns the division of two unsigned integers, with a division by zero flag.\r\n *\r\n * _Available since v3.4._\r\n */\r\n function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {\r\n if (b == 0) return (false, 0);\r\n return (true, a / b);\r\n }\r\n\r\n /**\r\n * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.\r\n *\r\n * _Available since v3.4._\r\n */\r\n function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {\r\n if (b == 0) return (false, 0);\r\n return (true, a % b);\r\n }\r\n\r\n /**\r\n * @dev Returns the addition of two unsigned integers, reverting on\r\n * overflow.\r\n *\r\n * Counterpart to Solidity's `+` operator.\r\n *\r\n * Requirements:\r\n *\r\n * - Addition cannot overflow.\r\n */\r\n function add(uint256 a, uint256 b) internal pure returns (uint256) {\r\n uint256 c = a + b;\r\n require(c >= a, \"SafeMath: addition overflow\");\r\n return c;\r\n }\r\n\r\n /**\r\n * @dev Returns the subtraction of two unsigned integers, reverting on\r\n * overflow (when the result is negative).\r\n *\r\n * Counterpart to Solidity's `-` operator.\r\n *\r\n * Requirements:\r\n *\r\n * - Subtraction cannot overflow.\r\n */\r\n function sub(uint256 a, uint256 b) internal pure returns (uint256) {\r\n require(b <= a, \"SafeMath: subtraction overflow\");\r\n return a - b;\r\n }\r\n\r\n /**\r\n * @dev Returns the multiplication of two unsigned integers, reverting on\r\n * overflow.\r\n *\r\n * Counterpart to Solidity's `*` operator.\r\n *\r\n * Requirements:\r\n *\r\n * - Multiplication cannot overflow.\r\n */\r\n function mul(uint256 a, uint256 b) internal pure returns (uint256) {\r\n if (a == 0) return 0;\r\n uint256 c = a * b;\r\n require(c / a == b, \"SafeMath: multiplication overflow\");\r\n return c;\r\n }\r\n\r\n /**\r\n * @dev Returns the integer division of two unsigned integers, reverting on\r\n * division by zero. The result is rounded towards zero.\r\n *\r\n * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n * uses an invalid opcode to revert (consuming all remaining gas).\r\n *\r\n * Requirements:\r\n *\r\n * - The divisor cannot be zero.\r\n */\r\n function div(uint256 a, uint256 b) internal pure returns (uint256) {\r\n require(b > 0, \"SafeMath: division by zero\");\r\n return a / b;\r\n }\r\n\r\n /**\r\n * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n * reverting when dividing by zero.\r\n *\r\n * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n * invalid opcode to revert (consuming all remaining gas).\r\n *\r\n * Requirements:\r\n *\r\n * - The divisor cannot be zero.\r\n */\r\n function mod(uint256 a, uint256 b) internal pure returns (uint256) {\r\n require(b > 0, \"SafeMath: modulo by zero\");\r\n return a % b;\r\n }\r\n\r\n /**\r\n * @dev Returns the subtraction of two unsigned integers, reverting with custom message on\r\n * overflow (when the result is negative).\r\n *\r\n * CAUTION: This function is deprecated because it requires allocating memory for the error\r\n * message unnecessarily. For custom revert reasons use {trySub}.\r\n *\r\n * Counterpart to Solidity's `-` operator.\r\n *\r\n * Requirements:\r\n *\r\n * - Subtraction cannot overflow.\r\n */\r\n function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {\r\n require(b <= a, errorMessage);\r\n return a - b;\r\n }\r\n\r\n /**\r\n * @dev Returns the integer division of two unsigned integers, reverting with custom message on\r\n * division by zero. The result is rounded towards zero.\r\n *\r\n * CAUTION: This function is deprecated because it requires allocating memory for the error\r\n * message unnecessarily. For custom revert reasons use {tryDiv}.\r\n *\r\n * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n * uses an invalid opcode to revert (consuming all remaining gas).\r\n *\r\n * Requirements:\r\n *\r\n * - The divisor cannot be zero.\r\n */\r\n function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {\r\n require(b > 0, errorMessage);\r\n return a / b;\r\n }\r\n\r\n /**\r\n * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n * reverting with custom message when dividing by zero.\r\n *\r\n * CAUTION: This function is deprecated because it requires allocating memory for the error\r\n * message unnecessarily. For custom revert reasons use {tryMod}.\r\n *\r\n * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n * invalid opcode to revert (consuming all remaining gas).\r\n *\r\n * Requirements:\r\n *\r\n * - The divisor cannot be zero.\r\n */\r\n function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {\r\n require(b > 0, errorMessage);\r\n return a % b;\r\n }\r\n}\r\n\r\n\r\n// File @openzeppelin/contracts/utils/[email protected]\r\n\r\n\r\n\r\npragma solidity ^0.8.7;\r\n\r\n\r\n/**\r\n * @dev Collection of functions related to the address type\r\n */\r\nlibrary Address {\r\n /**\r\n * @dev Returns true if `account` is a contract.\r\n *\r\n * [IMPORTANT]\r\n * ====\r\n * It is unsafe to assume that an address for which this function returns\r\n * false is an externally-owned account (EOA) and not a contract.\r\n *\r\n * Among others, `isContract` will return false for the following\r\n * types of addresses:\r\n *\r\n * - an externally-owned account\r\n * - a contract in construction\r\n * - an address where a contract will be created\r\n * - an address where a contract lived, but was destroyed\r\n * ====\r\n */\r\n function isContract(address account) internal view returns (bool) {\r\n // This method relies on extcodesize, which returns 0 for contracts in\r\n // construction, since the code is only stored at the end of the\r\n // constructor execution.\r\n\r\n uint256 size;\r\n // solhint-disable-next-line no-inline-assembly\r\n assembly { size := extcodesize(account) }\r\n return size > 0;\r\n }\r\n\r\n /**\r\n * @dev Replacement for Solidity's `transfer`: sends `amount` wei to\r\n * `recipient`, forwarding all available gas and reverting on errors.\r\n *\r\n * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\r\n * of certain opcodes, possibly making contracts go over the 2300 gas limit\r\n * imposed by `transfer`, making them unable to receive funds via\r\n * `transfer`. {sendValue} removes this limitation.\r\n *\r\n * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\r\n *\r\n * IMPORTANT: because control is transferred to `recipient`, care must be\r\n * taken to not create reentrancy vulnerabilities. Consider using\r\n * {ReentrancyGuard} or the\r\n * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\r\n */\r\n function sendValue(address payable recipient, uint256 amount) internal {\r\n require(address(this).balance >= amount, \"Address: insufficient balance\");\r\n\r\n // solhint-disable-next-line avoid-low-level-calls, avoid-call-value\r\n (bool success, ) = recipient.call{ value: amount }(\"\");\r\n require(success, \"Address: unable to send value, recipient may have reverted\");\r\n }\r\n\r\n /**\r\n * @dev Performs a Solidity function call using a low level `call`. A\r\n * plain`call` is an unsafe replacement for a function call: use this\r\n * function instead.\r\n *\r\n * If `target` reverts with a revert reason, it is bubbled up by this\r\n * function (like regular Solidity function calls).\r\n *\r\n * Returns the raw returned data. To convert to the expected return value,\r\n * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\r\n *\r\n * Requirements:\r\n *\r\n * - `target` must be a contract.\r\n * - calling `target` with `data` must not revert.\r\n *\r\n * _Available since v3.1._\r\n */\r\n function functionCall(address target, bytes memory data) internal returns (bytes memory) {\r\n return functionCall(target, data, \"Address: low-level call failed\");\r\n }\r\n\r\n /**\r\n * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\r\n * `errorMessage` as a fallback revert reason when `target` reverts.\r\n *\r\n * _Available since v3.1._\r\n */\r\n function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {\r\n return functionCallWithValue(target, data, 0, errorMessage);\r\n }\r\n\r\n /**\r\n * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\r\n * but also transferring `value` wei to `target`.\r\n *\r\n * Requirements:\r\n *\r\n * - the calling contract must have an ETH balance of at least `value`.\r\n * - the called Solidity function must be `payable`.\r\n *\r\n * _Available since v3.1._\r\n */\r\n function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {\r\n return functionCallWithValue(target, data, value, \"Address: low-level call with value failed\");\r\n }\r\n\r\n /**\r\n * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\r\n * with `errorMessage` as a fallback revert reason when `target` reverts.\r\n *\r\n * _Available since v3.1._\r\n */\r\n function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {\r\n require(address(this).balance >= value, \"Address: insufficient balance for call\");\r\n require(isContract(target), \"Address: call to non-contract\");\r\n\r\n // solhint-disable-next-line avoid-low-level-calls\r\n (bool success, bytes memory returndata) = target.call{ value: value }(data);\r\n return _verifyCallResult(success, returndata, errorMessage);\r\n }\r\n\r\n /**\r\n * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\r\n * but performing a static call.\r\n *\r\n * _Available since v3.3._\r\n */\r\n function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {\r\n return functionStaticCall(target, data, \"Address: low-level static call failed\");\r\n }\r\n\r\n /**\r\n * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],\r\n * but performing a static call.\r\n *\r\n * _Available since v3.3._\r\n */\r\n function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {\r\n require(isContract(target), \"Address: static call to non-contract\");\r\n\r\n // solhint-disable-next-line avoid-low-level-calls\r\n (bool success, bytes memory returndata) = target.staticcall(data);\r\n return _verifyCallResult(success, returndata, errorMessage);\r\n }\r\n\r\n /**\r\n * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\r\n * but performing a delegate call.\r\n *\r\n * _Available since v3.4._\r\n */\r\n function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {\r\n return functionDelegateCall(target, data, \"Address: low-level delegate call failed\");\r\n }\r\n\r\n /**\r\n * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],\r\n * but performing a delegate call.\r\n *\r\n * _Available since v3.4._\r\n */\r\n function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {\r\n require(isContract(target), \"Address: delegate call to non-contract\");\r\n\r\n // solhint-disable-next-line avoid-low-level-calls\r\n (bool success, bytes memory returndata) = target.delegatecall(data);\r\n return _verifyCallResult(success, returndata, errorMessage);\r\n }\r\n\r\n function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {\r\n if (success) {\r\n return returndata;\r\n } else {\r\n // Look for revert reason and bubble it up if present\r\n if (returndata.length > 0) {\r\n // The easiest way to bubble the revert reason is using memory via assembly\r\n\r\n // solhint-disable-next-line no-inline-assembly\r\n assembly {\r\n let returndata_size := mload(returndata)\r\n revert(add(32, returndata), returndata_size)\r\n }\r\n } else {\r\n revert(errorMessage);\r\n }\r\n }\r\n }\r\n}\r\n\r\n\r\n// File @openzeppelin/contracts/token/ERC20/[email protected]\r\n\r\n\r\n\r\npragma solidity ^0.8.7;\r\n\r\n\r\n\r\n\r\n/**\r\n * @title SafeERC20\r\n * @dev Wrappers around ERC20 operations that throw on failure (when the token\r\n * contract returns false). Tokens that return no value (and instead revert or\r\n * throw on failure) are also supported, non-reverting calls are assumed to be\r\n * successful.\r\n * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,\r\n * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.\r\n */\r\nlibrary SafeERC20 {\r\n using SafeMath for uint256;\r\n using Address for address;\r\n\r\n function safeTransfer(IERC20 token, address to, uint256 value) internal {\r\n _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));\r\n }\r\n\r\n function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {\r\n _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));\r\n }\r\n\r\n /**\r\n * @dev Deprecated. This function has issues similar to the ones found in\r\n * {IERC20-approve}, and its usage is discouraged.\r\n *\r\n * Whenever possible, use {safeIncreaseAllowance} and\r\n * {safeDecreaseAllowance} instead.\r\n */\r\n function safeApprove(IERC20 token, address spender, uint256 value) internal {\r\n // safeApprove should only be called when setting an initial allowance,\r\n // or when resetting it to zero. To increase and decrease it, use\r\n // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'\r\n // solhint-disable-next-line max-line-length\r\n require((value == 0) || (token.allowance(address(this), spender) == 0),\r\n \"SafeERC20: approve from non-zero to non-zero allowance\"\r\n );\r\n _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));\r\n }\r\n\r\n function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {\r\n uint256 newAllowance = token.allowance(address(this), spender).add(value);\r\n _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));\r\n }\r\n\r\n function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {\r\n uint256 newAllowance = token.allowance(address(this), spender).sub(value, \"SafeERC20: decreased allowance below zero\");\r\n _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));\r\n }\r\n\r\n /**\r\n * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement\r\n * on the return value: the return value is optional (but if data is returned, it must not be false).\r\n * @param token The token targeted by the call.\r\n * @param data The call data (encoded using abi.encode or one of its variants).\r\n */\r\n function _callOptionalReturn(IERC20 token, bytes memory data) private {\r\n // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since\r\n // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that\r\n // the target address contains contract code and also asserts for success in the low-level call.\r\n\r\n bytes memory returndata = address(token).functionCall(data, \"SafeERC20: low-level call failed\");\r\n if (returndata.length > 0) { // Return data is optional\r\n // solhint-disable-next-line max-line-length\r\n require(abi.decode(returndata, (bool)), \"SafeERC20: ERC20 operation did not succeed\");\r\n }\r\n }\r\n}\r\n\r\n\r\n// File @openzeppelin/contracts/utils/[email protected]\r\n\r\n\r\n\r\n\r\n\r\n/*\r\n * @dev Provides information about the current execution context, including the\r\n * sender of the transaction and its data. While these are generally available\r\n * via msg.sender and msg.data, they should not be accessed in such a direct\r\n * manner, since when dealing with GSN meta-transactions the account sending and\r\n * paying for execution may not be the actual sender (as far as an application\r\n * is concerned).\r\n *\r\n * This contract is only required for intermediate, library-like contracts.\r\n */\r\nabstract contract Context {\r\n function _msgSender() internal view virtual returns (address payable) {\r\n return payable(msg.sender);\r\n }\r\n\r\n function _msgData() internal view virtual returns (bytes memory) {\r\n this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691\r\n return msg.data;\r\n }\r\n}\r\n\r\n\r\n// File @openzeppelin/contracts/access/[email protected]\r\n\r\n\r\n\r\n\r\n/**\r\n * @dev Contract module which provides a basic access control mechanism, where\r\n * there is an account (an owner) that can be granted exclusive access to\r\n * specific functions.\r\n *\r\n * By default, the owner account will be the one that deploys the contract. This\r\n * can later be changed with {transferOwnership}.\r\n *\r\n * This module is used through inheritance. It will make available the modifier\r\n * `onlyOwner`, which can be applied to your functions to restrict their use to\r\n * the owner.\r\n */\r\nabstract contract Ownable is Context {\r\n address private _owner;\r\n\r\n event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);\r\n\r\n /**\r\n * @dev Initializes the contract setting the deployer as the initial owner.\r\n */\r\n constructor () internal {\r\n address msgSender = _msgSender();\r\n _owner = msgSender;\r\n emit OwnershipTransferred(address(0), msgSender);\r\n }\r\n\r\n /**\r\n * @dev Returns the address of the current owner.\r\n */\r\n function owner() public view virtual returns (address) {\r\n return _owner;\r\n }\r\n\r\n /**\r\n * @dev Throws if called by any account other than the owner.\r\n */\r\n modifier onlyOwner() {\r\n require(owner() == _msgSender(), \"Ownable: caller is not the owner\");\r\n _;\r\n }\r\n\r\n /**\r\n * @dev Leaves the contract without owner. It will not be possible to call\r\n * `onlyOwner` functions anymore. Can only be called by the current owner.\r\n *\r\n * NOTE: Renouncing ownership will leave the contract without an owner,\r\n * thereby removing any functionality that is only available to the owner.\r\n */\r\n function renounceOwnership() public virtual onlyOwner {\r\n emit OwnershipTransferred(_owner, address(0));\r\n _owner = address(0);\r\n }\r\n\r\n /**\r\n * @dev Transfers ownership of the contract to a new account (`newOwner`).\r\n * Can only be called by the current owner.\r\n */\r\n function transferOwnership(address newOwner) public virtual onlyOwner {\r\n require(newOwner != address(0), \"Ownable: new owner is the zero address\");\r\n emit OwnershipTransferred(_owner, newOwner);\r\n _owner = newOwner;\r\n }\r\n}\r\n\r\n\r\n// File contracts/Timelock.sol\r\n\r\n\r\n\r\n\r\n\r\n/**\r\n * @dev A token holder contract that will allow a beneficiary to extract the\r\n * tokens after a given release time.\r\n *\r\n * Useful for simple vesting schedules like \"advisors get all of their tokens\r\n * after 1 year\".\r\n */\r\ncontract FRINKLPLOCKCONTRACT {\r\n using SafeERC20 for IERC20;\r\n\r\n // ERC20 basic token contract being held\r\n IERC20 private _token;\r\n\r\n // beneficiary of tokens after they are released\r\n address private _beneficiary;\r\n\r\n // timestamp when token release is enabled\r\n uint256 private _releaseTime;\r\n\r\n constructor(\r\n IERC20 token,\r\n address beneficiary\r\n ) public {\r\n\r\n _token = token;\r\n _beneficiary = beneficiary;\r\n _releaseTime = block.timestamp + 300 days;\r\n\r\n }\r\n\r\n /**\r\n * @return the token being held.\r\n */\r\n function token() public view returns (IERC20) {\r\n return _token;\r\n }\r\n\r\n /**\r\n * @return the beneficiary of the tokens.\r\n */\r\n function beneficiary() public view returns (address) {\r\n return _beneficiary;\r\n }\r\n\r\n /**\r\n * @return the time when the tokens are released.\r\n */\r\n function releaseTime() public view returns (uint256) {\r\n return _releaseTime;\r\n }\r\n\r\n /**\r\n * @notice Transfers tokens held by timelock to beneficiary.\r\n */\r\n function release() public {\r\n require(block.timestamp >= _releaseTime, \"TokenTimelock: current time is before release time\");\r\n\r\n uint256 amount = _token.balanceOf(address(this));\r\n require(amount > 0, \"TokenTimelock: no tokens to release\");\r\n\r\n _token.safeTransfer(_beneficiary, amount);\r\n }\r\n}"
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