./corewar don't check the extension file .cor

[tlenglin]

./corewar don't check the extension file .cor

[Emil Wallner]

@Natansab What's your take on this?

[Natan Sabbah]

if (ft_strlen(e->files[e->player[i].file_pos]) <= 4 ||
strcmp(e->files[e->player[i].file_pos] +
ft_strlen(e->files[e->player[i].file_pos]) - 4,".cor"))
ft_exit(e, 11);

code to check if .cor file
@emilwallner