function that prints all the elements of a listint_t list. function that returns the number of elements in a linked listint_t list. function that adds a new node at the beginning of a listint_t list. function that adds a new node at the end of a listint_t list. function that frees a listint_t list. function that frees a listint_t list and sets the head pointer to NULL. function that deletes the head node of a listint_t linked list, and returns the head node’s data (n) function that returns the nth node of a listint_t linked list. function that returns the sum of all the data (n) of a listint_t linked list. function that inserts a new node at a given position. function that deletes the node at index index of a listint_t linked list. unction that reverses a linked list. function that prints a listint_t linked list, safely. function that frees a listint_t list, safely. function that finds the loop in a linked list.