triPartition, void function in C

Tri-Partition We are given a singly linked list and a pivot. We need to move those nodes with number less than pivot to the front. Those nodes with the same number as pivot will move to the middle. The rest will move to the back. Write a function tripartition() to realize this partition process on a linked list. a The function prototype is given as follow: void tripartition(ListNode" head, int pivot); Input format: The 1st line is the pivot The 2nd line is the data ended with a non-digit symbol Example: Input: 5 815 5 725 a Output: 125 5 5 87