0x13-more_singly_linked_lists 0-print_listint.c 1-listint_len.c 10-delete_nodeint.c 100-reverse_listint.c 101-print_listint_safe.c 102-free_listint_safe.c 103-find_loop.c 2-add_nodeint.c 3-add_nodeint_end.c 4-free_listint.c 5-free_listint2.c 6-pop_listint.c 7-get_nodeint.c 8-sum_listint.c 9-insert_nodeint.c _putchar.c lists.h