ADD: strncmp unit test

real_tests/ft_strncmp/00_launcher.c

@@ -6,7 +6,7 @@ int	strncmp_launcher(void)
 	size_t		res;
 
 	testlist = NULL;
-	load_test(&testlist, "OK test", &atoi_ok_test);
+	load_test(&testlist, "OK test", &strncmp_ok_test);
 	res = launch_tests(testlist, "ft_strncmp");
 	clear_tests(&testlist);
 	return (res);

real_tests/ft_strncmp/01_ok.c

@@ -0,0 +1,6 @@
+#include "../tests.h"
+
+int	strncmp_ok_test(void)
+{
+	return (ft_strncmp("test", "test", 4));
+}

real_tests/ft_strncmp/02_ko_test.c

@@ -0,0 +1,6 @@
+#include "../tests.h"
+
+int	strncmp_ko_test(void)
+{
+	return (ft_strncmp("blabla", "test", 4));
+}