AppendDataLinkedList

//: Append data to linked List
extension LinkedList {

    func append(_ node : Node) {
        //Check for empty Linked List and assign the node to head if empty
        guard head != nil else {
            head = node
            return
        }
        
        var current = head
        // Loop to the last element in the Linked List
        while let _ = current?.next {
            current = current?.next
        }
        // Retrieved the last element
        current?.next = node
    }
}