83. Remove Duplicates from Sorted List

public class Solution {
public ListNode deleteDuplicates(ListNode head) {
if (head == null){
return null;
}
ListNode node = head;
while (node.next !=null){
if(node.val == node.next.val){
node.next = node.next.next;
}else {
node = node.next;
}
}
return head;
}
}