remove some unnecessary code

src/ast.c

@@ -232,8 +232,6 @@ struct mcc_ast_identifier *mcc_ast_new_identifier(char *value)
 	if (!id) {
 		return NULL;
 	}
-//	char *str = malloc((strlen(value) + 1) * sizeof(char));
-//	strcpy(str, value);
 
 	id->i_value = value;
 	return id;