using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("YourQuestion() returns " + YourQuestion());

        Console.WriteLine("AnswerOne() returns " + AnswerOne());

        Console.WriteLine("AnswerTwo() returns " + AnswerTwo());

    }

    private static bool condition1()

    {

        return false;

    }

    private static bool condition2()

    {

        return true;

    }

    private static bool condition3()

    {

        return true;

    }

    public static string YourQuestion() 

    {

        var thereIsAProblem = false;

        var problemDescription = "";        

        if (condition1()) {

            thereIsAProblem = true;

            problemDescription = "x";

        }

        if (!thereIsAProblem && condition2()) {

            thereIsAProblem = true;

            problemDescription = "y";

        }

        return problemDescription;

    }

    public static string AnswerOne() 

    {

        return checkCondition1() ??

               checkCondition2() ??

               checkCondition3();

    }   

    private static string checkCondition1()

    {       

        return condition1() ? "x" : null;       

    }

    private static string checkCondition2()

    {       

        return condition2() ? "y" : null;

    }

    private static string checkCondition3()

    {       

        return condition3() ? "z" : null;           

    }

    public static string AnswerTwo()

    {       

        var conditionChecks = new Dictionary<string,Func<bool>>();

        conditionChecks.Add("x",condition1);

        conditionChecks.Add("y",condition2);

        conditionChecks.Add("z",condition3);

        foreach (var check in conditionChecks)

        {           

            if (check.Value())

            {

                return check.Key;

            }

        }

        return null;

    }

}