using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        string toto = null;

        string test = "Hello {0}";

        //Console.WriteLine(string.Format(test, new object[0]));

        Console.WriteLine(GetValue(test, "titi", null));

    }

    private static string GetValue(string value, string name, params string[] arguments)

    {

        Console.WriteLine(arguments);

        Console.WriteLine(arguments is null);

        return arguments == null  

            ? value

            : string.Format(value ?? name, arguments);

    }

}