fix(lexer): keyword tokens now also contains the char *data

src/lexer/lexer.c

@@ -82,6 +82,11 @@ static void set_token_keyword(struct token *tok, char *begin, ssize_t size)
     {
         tok->type = TOKEN_ELSE;
     }
+
+    tok->data = calloc(size + 1, sizeof(char));
+    if (tok->data == NULL)
+        return;
+    strncpy(tok->data, begin, size);
 }
 
 /* @brief: if token_type has not yet been set, then it is a TOKEN_WORD