CO-CODE Hugo-Luke

+ last_exit_status set/get functions for here_doc
+ TODO : replace all occurences of last_exit_status
+ **environ fix
+ builtin_unset() fix

srcs/generic.c

@@ -137,6 +137,8 @@ void	*ft_resize_2d_arr(void *ptr, size_t add_nbr)
 	char			**new_arr;
 
 	new_arr = ft_calloc(ft_2d_arrlen(ptr) + add_nbr + 1, sizeof (void *));
+	if (!new_arr)
+		return (NULL);
 	arr = (char **)ptr;
 	i = 0;
 	while (arr[i])