fix: empty line is now not add to the history

main.c

@@ -31,6 +31,7 @@ static char	*ft_get_user_input(t_list **env)
 		return (NULL);
 	}
 	line = readline(prompt);
+	if (line != NULL && ft_strcmp(line, "") != 0)
 		add_history(line);
 	free(prompt);
 	return (line);