0203. Remove Linked List Elements

https://leetcode.com/problems/remove-linked-list-elements

Description

Given the head of a linked list and an integer val, remove all the nodes of the linked list that has Node.val == val, and return the new head.

Example 1:

**Input:** head = [1,2,6,3,4,5,6], val = 6
**Output:** [1,2,3,4,5]

Example 2:

**Input:** head = [], val = 1
**Output:** []

Example 3:

**Input:** head = [7,7,7,7], val = 7
**Output:** []

Constraints:

• The number of nodes in the list is in the range [0, 104].

• 1 <= Node.val <= 50

• 0 <= val <= 50

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