Remove Duplicates from Sorted List

Given a sorted linked list, delete all duplicates such that each element appear only once.

For example,
Given `1->1->2`, return `1->2`.
Given `1->1->2->3->3`, return `1->2->3`.

```/**
* Definition for singly-linked list.
* public class ListNode {
*     int val;
*     ListNode next;
*     ListNode(int x) { val = x; }
* }
*/
public class Solution {
public ListNode deleteDuplicates(ListNode head) {
if (head == null) {
}
ListNode start = head;
ListNode end = head.next;
while (end != null) {
if (start.val == end.val) {
end = end.next;
if (end == null) {
start.next = null;
}
} else {
start.next = end;
start = start.next;
end = end.next;
}
}
}
}```

Remove Duplicates from Sorted List

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Given a sorted linked list, delete all duplicates such that each element appear only once. Fo
Given a sorted linked list, delete all duplicates such that each element appear only once. Fo

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