comefrom: <awangdev>[lint]. Unique Characters_3.java
code: public boolean isUnique(String str) {
  		if (str == null || str.length() == 0) {
      		return true;
      	}
      	for (int i = 0; i < str.length(); i++) {
      		for (int j = i + 1; j < str.length(); j++) {
      			if (str.charAt(i) == str.charAt(j)) {
      				return false;
      			}
      		}
      	}
      	return true;
      }
masked: public boolean var_0 ( String var_1 ) {
    if ( var_1 == null || var_1 . length ( ) == 0 ) {
      return true ;
    }
    for ( int var_2 = 0 ;
    var_2 < var_1 . length ( ) ;
    var_2 ++ ) {
      for ( int var_3 = var_2 + 1 ;
      var_3 < var_1 . length ( ) ;
      var_3 ++ ) {
        if ( var_1 . charAt ( var_2 ) == var_1 . charAt ( var_3 ) ) {
          return false ;
        }
      }
    }
    return true ;
  }
  