Update Linked List

//: Insert Node at Index
extension LinkedList {
    func insertNode(_ node: Node, at position: Int) {
         guard position > 0 else {
            return
        }
        
        var counter = 1
        var current = head
        
        if position > 1 {
            while current != nil && counter < position {
                if counter == position - 1 {
                    node.next = current?.next
                    current?.next = node
                    break
                }
                current = current?.next
                counter += 1
            }
        } else if position == 1 {
            node.next = head
            head = node
        }
    }
}