Need help with the following assignment in C:

ODP210 Add a new node between the 2nd and 3rd nodes of a list OVERVIEW For this ODP, you are to write a function named "edit2" which inserts a new node between the 2nd and 3rd nodes of a list. * THIS LIST HAS NO SENTINEL NODE!* You'll be given the address of the first data node. Your function should create a new node and insert it into the list. The prototype for edit2 is: void edit2(int num, struct node *ptr); // new node's data value is "num" It should take a linked list as follows: ptr and insert a new node between here and here giving the list: ptr +--- num