83. Remove Duplicates from Sorted List

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