private static void Main()
{
var linkedList = new SinglyLinkedList <int>();
linkedList.AddFirst(2);
linkedList.AddFirst(1);
linkedList.AddFirst(0);
linkedList.AddFirst(-1);
Console.WriteLine(linkedList);
linkedList.Insert(0, 4);
Console.WriteLine(linkedList);
linkedList.RemoveFirst();
Console.WriteLine(linkedList);
Console.WriteLine(linkedList.GetFirst());
}
