FILE 0-print_listint.c - A function that prints all the elements of a listint_t list.
FILE 1-listint_len.c - A function that returns the number of elements in a linked listint_t list.
FILE 2-add_nodeint.c - a function that adds a new node at the beginning of a listint_t list.
FILE 3-add_nodeint_end.c - a function that adds a new node at the end of a listint_t list.
FILE 4-free_listint.c - a function that frees a listint_t list.
FILE 5-free_listint2.c - a function that frees a listint_t list.
FILE 6-pop_listint.c - a function that deletes the head node of a listint_t linked list, and returns the head node’s data (n).
FILE 7-get_nodeint.c - a function that returns the nth node of a listint_t linked list.
FILE 8-sum_listint.c - a function that returns the sum of all the data (n) of a listint_t linked list.
FILE 9-insert_nodeint.c - a function that inserts a new node at a given position.
FILE 10-delete_nodeint.c - a function that deletes the node at index index of a listint_t linked list.
FILE 100-reverse_listint.c - a function that reverses a listint_t linked list.
FILE 101-print_listint_safe.c - a function that prints a listint_t linked list.