Given the following class structure for a doubly LinkedList, implement the function removeNode(int i) that removes the ith node from the list. Your function should properly check that removing the ith node is a valid operation, and remove any unused pointers so the garbage collector may properly delete the memory. public class LinkedList { private Node first; private static class Node { public Node() {} public double item; public Node next, prev; } public void removeItem(int i) { // TODO }