refactor: fix the makefile problems

real_tests/tests.h

@@ -6,7 +6,7 @@
 /*   By: elagouch <elagouch@student.42lyon.fr>      +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2026/01/24 15:32:30 by elagouch          #+#    #+#             */
-/*   Updated: 2026/01/24 16:33:14 by elagouch         ###   ########.fr       */
+/*   Updated: 2026/01/24 18:40:48 by elagouch         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -15,6 +15,9 @@
 
 # include "libunit.h"
 
+// LAUNCHERS
+int strlen_launcher(void);
+
 // strlen
 int test_basic(void);
 int test_null(void);