using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        //Console.WriteLine(FormAddress("address1", "address2", "address3", "city", "state", "zip", "country"));

        Console.WriteLine(FormAddress("nyt", null, "", "", "hhr", "", ""));

    }

    static string FormAddress(string address1, string address2, string address3, string city, string state, string zip, string country)

    {

        var array = new[] { address1, address2, address3, city, state, zip, country };

        var address = string.Join(", ", array.Where(x => !string.IsNullOrWhiteSpace(x)));

        return address;

    }

}