using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var inputs = new List<string>

        {

            "https://www.instagram.com/kullanici_adi",

            "https://www.instagram.com/kullanici_adi/",

            "https://instagram.com/@kullanici_adi",

            "https://instagram.com/@kullanici_adi/",

​

            "https://instagram.com/kullanici_adi",

            "https://instagram.com/kullanici_adi/",

​

            "https://instagram.com/kullanici_adi?igshid=OGQ5ZDc2ODk2ZA==",

​

            "https://kullanici_adi",

​

            "https://www.instagram.com/",

            "@kullanici_adi",

            "kullanıcı adı",

            null,

            ""

        };

​

        foreach (var input in inputs)

        {

             var clearAddress = ClearAddress(input, "instagram");

            Console.WriteLine(clearAddress.nickName + " " + clearAddress.isCorrect);

        }

    }

    static (string nickName, bool isCorrect) ClearAddress(string address, string socialMedia)

    {

        if (string.IsNullOrWhiteSpace(address))

        {

            return (string.Empty, false);

        }

        if (address.Contains($"https://www.{socialMedia}.com/"))

        {

            address = address.Replace($"https://www.{socialMedia}.com/", string.Empty);

        }

​

        if (address.Contains($"https://{socialMedia}.com/"))

        {

            address = address.Replace($"https://{socialMedia}.com/", string.Empty);

        }

​

        if (address.Contains($"www.{socialMedia}.com/"))

        {

            address = address.Replace($"www.{socialMedia}.com/", string.Empty);

        }

​

        if (address.Contains($"{socialMedia}.com/"))

        {

            address = address.Replace($"{socialMedia}.com/", string.Empty);

        }

​

        if (address.StartsWith("https://"))

        {

            address = address[8..];

        }

​

        if (address.StartsWith("http://"))

        {

            address = address[7..];

        }

​

        if (address.EndsWith('/'))

        {

            address = address[..^1];

        }

​

        if (address.StartsWith('@'))

        {

            address = address[1..];

        }

​

        if (address.Contains('?'))

        {

            address = address.Split('?')[0];

        }

​

        var isCorrect = !address.Contains(' ');

​

        if (string.IsNullOrWhiteSpace(address))

        {

            isCorrect = false;

        }

​

        return (address, isCorrect);

    }

}