static void Recursion()
{
Console.WriteLine("test :: " + RecursionTools.IsPalindrome("test"));
Console.WriteLine("radar :: " + RecursionTools.IsPalindrome("radar"));
Console.WriteLine("raddar :: " + RecursionTools.IsPalindrome("raddar"));
Console.WriteLine("regninger :: " + RecursionTools.IsPalindrome("regninger"));
Console.WriteLine("5^3 = " + RecursionTools.Power(5, 3));
Console.WriteLine($"5! = {RecursionTools.Factorial(5)}");
}