def remove_dupes(head: ListNode) -> ListNode:
if head:
node = ListNode(head.val)
head = head.next
else:
return ListNode("")
new_head = node
while head:
if head.val != node.val:
node.next = ListNode(head.val)
node = node.next
head = head.next
return new_head
def del_node(node: ListNode):
while node.next.next:
node.val = node.next.val
node = node.next
node.val = node.next.val
node.next = None
