using System;

using System.Linq;

public class Program

{

    /// <remarks>

    /// Translate English text in to Pig Latin. Based on the rules outlined on Wikipedia:

    /// https://en.wikipedia.org/wiki/Pig_Latin

    /// </remarks>

    static string EnglishToPigLatin(string english)

    {

        if (IsVowel(english[0])) {

            return english + "ay";

        }

        var firstConsCount = english.TakeWhile(IsConsonant).Count();

        if (firstConsCount > 1) {

            return english.Substring(firstConsCount) + english.Substring(0, firstConsCount) + "ay";

        } else {

            return english.Substring(1) + english[0] + "ay";

        }

    }

    static bool IsVowel(char c) => "aeiou".Contains(c, StringComparison.InvariantCultureIgnoreCase);

    static bool IsConsonant(char c) => !IsVowel(c);

    public static void Main()

    {

        // Unit tests. Press "Run" above, then check the output below to see if they pass.

        Test("pig", "igpay");

        Test("latin", "atinlay");

        Test("banana", "ananabay");

        Test("smile", "ilesmay");

        Test("string", "ingstray");

        Test("angel", "angelay");

        Results();

    }

    // What follows is a very short unit testing framework.

    static int pass, fail;

​

    static void Test(string input, string expected)

    {

        Console.WriteLine("Test: " + input);

        var actual = EnglishToPigLatin(input);

        if (actual == expected)

        {

            pass++;

            Console.WriteLine("PASS.\n");

            return;

        }

        fail++;

        Console.WriteLine("FAIL:");

        Console.WriteLine("    Expected: " + expected);

        Console.WriteLine("    Actual  : " + actual);

        Console.WriteLine();

    }

    static void Results()

    {

        Console.WriteLine($"{pass} / {pass + fail} tests passed.\n");

        Console.WriteLine(fail == 0 ? "SUCCESS!" : "FAILURE!");

    }

}

​