83. Remove Duplicates from Sorted List

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: Input: head = [1,1,2] Output: [1,2] Example 2: 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 ascen