removeNode

public Node removeNode(Node head, int val) {
  Node fakeHead = new Node(0);
  Node tail = fakeHead;
  
  while (head != null) {
    if (head.val != val) {
      tail.next = head;
      tail = tail.next;
    }
    head = head.next;
  }
  tail.next = null;
  return fakeHead.next;
}

public NOde removeNode(Node node, int val) {
  if (node == null) {
    return null;
  } else if (node.val == val) {
    return removeNode(node.next, val);
  } else {
    node.next = removeNode(node.next, val);
    return node;
  }
}