Example is for ex13:
$ gcc -Wall -Wextra -Werror ft_list_merge.c ../ex00/ft_create_elem.c ../school21-day11-tests/print_list.c ../school21-day11-tests/ex13/main.c
$ cat ../school21-day11-tests/ex13/main.c
00: OK. 01: OK. 02: OK. 03: OK. 04: OK. 05: KO. I haven't seen a man who did this, but I've heard that there were guys with OK on it. Really strange one. 06: OK. 07: OK. 08: OK. 09: OK. 10: OK. 11: OK. 12: KO. Segmentation fault (Signal -11). Found the mistake. Tests probably do cover it now. 13: OK. 14: KO. Tests are completely wrong. Read the task precisely. 15: KO. Tests are completely wrong. Read the task precisely. 16: KO. Tests are completely wrong. Read the task precisely. 17: KO. Don't cheese it ;) or expect anti-cheese and act appropriately.