anchor.diff:  class Lexer {
     var keywords = new Map<String, TokenType>();
     List<Token> _tokenStream;
  -  String intBuffer ="";
  -  String varBuffer ="";
  +  String intBuffer = "";
  +  String varBuffer = "";
   
     Lexer() {
       keywords["+"] = TokenType.PLUS;
  
positive.code:             // the intBuffer contains no string and the current string is a variable, so both Tokens are added to the tokenStream.
              // print("was in text case");
              varBuffer = varBuffer.concat(si);
            }
          }
        }
  
negative.code:        */
        if(keywords.containsKey(si)) {
          // check and or do intBuffer and varBuffer
          if(intBuffer.length > 0)
            doIntBuffer(tempTokenStream);
          if(varBuffer.length > 0)
            doVarBuffer(tempTokenStream);
          tempTokenStream.add(new Token(si, keywords[si]));
        } else {
          // check if the current string is a Number. If it's the case add the string to the intBuffer.
  