using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var personNames = new List<string>{

            "John Doe",

            "Mike Johnson",

            "Steve Molder",

            "Nick Dawson",

        };

        char startsWith = 'D';

        string formattedOutput = GetFormattedPersonList(personNames, startsWith);

        string a = "John Doe, Nick Dawson";

    }

    public static string GetFormattedPersonList(List<string> personNames, char startsWith){

        return "";

    }

}