✅ Formatting A Phone Number

using System;
using System.Text.RegularExpressions;

class PhoneNumberFormatter
{
    public static string FormatUniversalPhoneNumber(string phoneNumber)
    {
        // Remove non-numeric characters from the input
        string cleanedNumber = Regex.Replace(phoneNumber, "[^0-9]", "");

        // Check if the number has a country code and format accordingly
        if (cleanedNumber.Length > 10)
        {
            return $"+{cleanedNumber.Substring(0, cleanedNumber.Length - 10)} " +
                   $"{cleanedNumber.Substring(cleanedNumber.Length - 10, 3)}-" +
                   $"{cleanedNumber.Substring(cleanedNumber.Length - 7, 3)}-" +
                   $"{cleanedNumber.Substring(cleanedNumber.Length - 4, 4)}";
        }
        else if (cleanedNumber.Length == 10)
        {
            return $"{cleanedNumber.Substring(0, 3)}-{cleanedNumber.Substring(3, 3)}-" +
                   $"{cleanedNumber.Substring(6, 4)}";
        }
        else
        {
            // If the number doesn't follow the standard length, return the cleaned number as is
            return cleanedNumber;
        }
    }

    static void Main()
    {
        string phoneNumber = "+1 (555) 123-4567";
        string formattedNumber = FormatUniversalPhoneNumber(phoneNumber);
        Console.WriteLine($"Formatted number: {formattedNumber}");
    }
}