Write a method that adds an element after the first and another before the last element of a nonempty linked list, using a list iterator.

Complete the following file:

LinkedListUtil.java

import java.util.LinkedList; import java.util.ListIterator; public class LinkedListUtil { /** Adds an element after the first and another before the last element of a linked list. @param iter a linked list iterator @param front the element to add after the first element @param back the element to add before the last element */ public static void processList(ListIterator<String> iter, String front, String back) { // Your work here } // This method is used to check your work public static LinkedList<String> check(String[] values, String s1, String s2) { LinkedList<String> list = new LinkedList<String>(); for (String s : values) list.addLast(s); processList(list.listIterator(), s1, s2); return list; } }