Remove Duplicates

LINKED LIST

### Problem

Given the `head`

of a sorted linked list, delete all nodes that have duplicate numbers, leaving only distinct numbers from the original list.

Return the linked list sorted as well.

### Examples

`deleteDuplicates([1,2,2,2,3,4,4,5]); // returns [1,3,5] // 2 and 4 are repeated so they // are removed from the final list`

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