Write a function Li stNode *removeFirst( ListNode *ptr) that is passed a linked list as parameter and returns the tai l of the list: That is, it removes the first node and returns what is left. The...

Write a function

Li stNode *removeFirst( ListNode *ptr)

that is passed a linked list as parameter and returns the tai l of the list: That is, it

removes the first node and returns what is left. The function should deallocate the

storage of the removed node. The function returns null ptr if the list passed to it

is empty.