Remove Duplicate Node From Sorted Linked List

/**

 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode() {}
 *     ListNode(int val) { this.val = val; }
 *     ListNode(int val, ListNode next) { this.val = val; this.next = next; }
 * }
 */
class Solution {
    public ListNode deleteDuplicates(ListNode head) {

        if(head == null){
            return head;
        }

        ListNode newHead = head;

        while(newHead.next != null){
            if(newHead.val == newHead.next.val){
                newHead.next = newHead.next.next;
            }
            else {
                newHead = newHead.next;
            }
        }return head;
        
    }
}

Note: Isme ham head.next isliye kar rhe hai kyo ki ham head != null ka wait nhi kar sakte
kyu ki null me kabhi data hota hi nhi hai aur na hi null ke bad koi next hota hai.

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