private static void binarySearchTree()
{
var node = new Node(10);
node.insert(5);
node.insert(15);
node.insert(8);
Console.WriteLine($"Contains '8'?: [{node.contains(8)}]");
Console.WriteLine($" InOrder: {node.printInOrder()}");
Console.WriteLine($" PreOrder: {node.printPreOrder()}");
Console.WriteLine($"PostOrder: {node.printPostOrder()}");
}