83\. Remove Duplicates from Sorted List

Easy

Given the `head` of a sorted linked list, _delete all duplicates such that each element appears only once_. Return _the linked list **sorted** as well_.

**Example 1:**

![](https://assets.leetcode.com/uploads/2021/01/04/list1.jpg)

**Input:** head = [1,1,2]

**Output:** [1,2] 

**Example 2:**

![](https://assets.leetcode.com/uploads/2021/01/04/list2.jpg)

**Input:** head = [1,1,2,3,3]

**Output:** [1,2,3] 

**Constraints:**

*   The number of nodes in the list is in the range `[0, 300]`.
*   `-100 <= Node.val <= 100`
*   The list is guaranteed to be **sorted** in ascending order.