public static void Main(string[] args)
Console.WriteLine("Name: JENIFER CARDENAS GOMEZ");
Console.WriteLine(test("abcd"));
Console.WriteLine(test("a"));
Console.WriteLine(test("xy"));
public static string test(string str)
? str.Substring(str.Length - 1) + str.Substring(1, str.Length - 2) + str.Substring(0, 1) : str;