using System;

public class Program

{

    public static void Main()

    {

        var program = new Program();

​

        var result = program.ParseCostCenterLocation("CC", "", "CH01B");

        Console.Write("Result: " + result);

        Console.WriteLine();

        result = program.ParseCostCenterLocation("", "", "CH01B");

        Console.Write("Result: " + result);

        Console.WriteLine();

​

        result = program.ParseCostCenterLocation("STORE", "", "CH01B");

        Console.Write("Result: " + result);

        Console.WriteLine();

​

        result = program.ParseCostCenterLocation("STORE", "P100123CH1", "CH01B");

        Console.Write("Result: " + result);

        Console.WriteLine();

    }

​

    public string ParseCostCenterLocation(string purchaseType, string projectId, string costCenter)

    {

        string result = "";

        if (false == string.IsNullOrEmpty(purchaseType))

        {

            switch(purchaseType)

            {

                case "CC":

                    result = costCenter;

                break;

            }

        } else if (true == string.IsNullOrEmpty(purchaseType) & true == string.IsNullOrEmpty(projectId))

        {

            result = costCenter;

        }

        return result;

    }

​

}