fixed crash in builtin export with "" argument

+ builtin unset now update PATH

srcs/builtins/unset.c

@@ -6,7 +6,7 @@
 /*   By: lperrey <lperrey@student.42.fr>            +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2021/12/05 17:05:05 by lperrey           #+#    #+#             */
-/*   Updated: 2021/12/05 18:14:28 by lperrey          ###   ########.fr       */
+/*   Updated: 2021/12/18 13:41:15 by lperrey          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -27,6 +27,8 @@ int	builtin_unset(int argc, char *argv[], t_all *c)
 	{
 		if (unset_env_var(argv[i]) == EXIT_FAILURE)
 			exit_value = EXIT_FAILURE;
+		if (ft_strncmp(argv[i], "PATH", 4 + 1) == 0)
+			c->path = retrieve_path();
 		i++;
 	}
 	return (exit_value);