refactor: rewrote tokenize and modified ohter funcs

Well i wanted to wildly change a lot of things about the lexer thinking
i could do something better but really all i found was automatic lexers
that at least for me don't really fit the project so a manual one it is,
i guess technically is a automata. Whatever, is good enough.

include/lexer.h

@@ -66,12 +66,12 @@ typedef struct {
         LexerErr err;
         int64_t number;
     };
-} I64Result;
+} LexerI64Result;
 
 // Lexer funtions as well as few functionality
 TokenizeResult tokenize(const char* input);
 ASTNodeResult tokenize_number(const char* input, size_t *offset);
-I64Result string_to_integer(const char buf[]);
+LexerI64Result string_to_integer(const char buf[]);
 bool isoperator(int c);
 Operator char_to_operator(int c);
 char operator_to_char(Operator op);