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//Title of this code
//Rextester.Program.Main is the entry point for your code. Don't change it.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static string[] SetPhoneNumberFormat(string xmlPhoneNumber)
        {     
            string[] Phon = new string[2];
            
            if ((xmlPhoneNumber.Length == 10 || xmlPhoneNumber.Length == 10 )&& xmlPhoneNumber.StartsWith("0")) // S'il s'agit d'un numéro français
            {
                Phon[0]= GetCode(xmlPhoneNumber.Substring(0,1));
                Phon[1]= xmlPhoneNumber.Substring(1,9);
            }
                
            else
            {
                
            }
                
               
                return Phon;

}
        public static string GetCode(string PhoneCode)
        {
            var code= string.Empty;
            if(PhoneCode == "0")
                code = "+33";
            else
            {
                if(PhoneCode.Substring(0,1)) !="+" )
                    PhoneCode = "+" + PhoneCode
                    
                code = PhoneCode;
            }
            return code;
        }
        
        public static void Main(string[] args)
        {
            var number = "0492725236";     //should match
          
            var a = SetPhoneNumberFormat(number);
            
            
            Console.WriteLine(a[0]);
            Console.WriteLine(a[1]);
       
          
        }
    }
}

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Compilation time: 0.08 sec, absolute running time: 0.05 sec, cpu time: 0.05 sec, average memory usage: 14 Mb, average nr of threads: 3