code 1, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

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

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
             string left ="";
        string right ="";
        string temp ="";
           int num;
    string str5 = "";
    string str6 = "";
    string st1 = "";
        string st2 = "";
        string st3 = "";
    int num2 = 0;
  
   // string str = "ABCDEFGHIJKLMNOPQRSTUVWXY";
        //string str ="UBCDEFGHIJKLMNOPQRSTUUWXU";
        string str ="1BC3EF2HIJKLMNOPQRST23WX1";
         Console.WriteLine("str : "+str);
    string str2 = str.Substring(0, 3) + str.Substring(5, 2) + str.Substring(8, 1) + str.Substring(13, 3) + str.Substring(0x12, 1);
    
          Console.WriteLine("str2 : "+str2);
        
    string str3 = str.Substring(3, 2) + str.Substring(7, 1) + str.Substring(9, 4) + str.Substring(0x10, 2) + str.Substring(0x13, 1);
        
        Console.WriteLine("str3 : "+str3);
    string str4 = str.Substring(str.Length - 5, 5);
        
        Console.WriteLine("str4 : "+str4);
        
    if (str4.Substring(0, 1) != str2.Substring(4, 1))
    {
        left = str4.Substring(0, 1);
       
        
         Console.WriteLine("left is : "+left);
         right = str2.Substring(4, 1);
        Console.WriteLine("right is : "+right);
        str4=str4.Replace(left,right);
        
        Console.WriteLine("now str2 : "+str2);
        Console.WriteLine("now str4 : "+str4);
        
        
    }
    if (str4.Substring(1, 1) != str3.Substring(0, 1))
    {
        
        left = str4.Substring(1, 1);
        
            Console.WriteLine("left is : "+left);
        
        
        right = str3.Substring(0, 1);
        
            Console.WriteLine("right is : "+right);
        
     str4=str4.Replace(left,right);
        Console.WriteLine("now str2 : "+str2);
        Console.WriteLine("now str3 : "+str3);
        Console.WriteLine("now str4 : "+str4);   
    }
    if (str4.Substring(str4.Length - 1, 1) != str2.Substring(0, 1))
    {
        
        left = str4.Substring(str4.Length - 1, 1);
        
         Console.WriteLine("left is : "+left);
        
         right = str2.Substring(0, 1);
        
        
         Console.WriteLine("right is : "+right);
        
         
     str4=str4.Replace(left,right);
        Console.WriteLine("now str2 : "+str2);
        Console.WriteLine("now str3 : "+str3);
        Console.WriteLine("now str4 : "+str4);   
        
    }
        Console.WriteLine("str3 lenth is : "+str3.Length);
            
            
            
    
            
             temp =Convert.ToString((int) (Convert.ToChar(str3.Substring(0, 1)) - '0'));
             Console.WriteLine("1st part of  str5 : "+temp);
            
             temp =Convert.ToString((int) (Convert.ToChar(str3.Substring(0, 1)) - '0'));
             Console.WriteLine("2nd part of  str5 : "+temp);
            
            temp="";
            
             temp =Convert.ToString((int) (Convert.ToChar(str3.Substring(1, 1)) - '0'));
             Console.WriteLine("1st part of  str5 : "+temp);
            
             temp =Convert.ToString((int) (Convert.ToChar(str3.Substring(1, 1)) - '0'));
             Console.WriteLine("2nd part of  str5 : "+temp);
            
             temp="";
            
             temp =Convert.ToString((int) (Convert.ToChar(str3.Substring(2, 1)) - '0'));
             Console.WriteLine("1st part of  str5 : "+temp);
            
             temp =Convert.ToString((int) (Convert.ToChar(str3.Substring(2, 1)) - '0'));
             Console.WriteLine("2nd part of  str5 : "+temp);
                
            
    for (num = 0; num < str3.Length; num++)
    {
        
        
        str5 = str5 + Convert.ToString((int) (Convert.ToChar(str3.Substring(num, 1)) - '0')).Substring(Convert.ToString((int) (Convert.ToChar(str3.Substring(num, 1)) - '0')).Length - 1, 1);
        
    }
        Console.WriteLine("str5 : "+str5);
     
        Console.WriteLine("str2 lenth is : "+str2.Length);
    for (num = 0; num < str2.Length; num++)
    {
        str6 = str6 + Convert.ToString((int) Convert.ToChar(str2.Substring(num, 1))).Substring(Convert.ToString((int) Convert.ToChar(str2.Substring(num, 1))).Length - 1, 1);
    }
        Console.WriteLine("str6 : "+str6);
        
    if (str5 != str6)
    {
       
    }
   
    int num3 = 0;
    string str12 = "";
    for (num = 0; num < str3.Length; num++)
    {
        num3 = Convert.ToChar(str3.Substring(num, 1));
        str12 = Convert.ToString((int) (Convert.ToChar(str3.Substring(num, 1)) - '0')).Substring(Convert.ToString((int) (Convert.ToChar(str3.Substring(num, 1)) - '0')).Length - 1, 1);
        num2 += Convert.ToInt32(str12);
       
    }
         Console.WriteLine("str12 : "+str12);
    str5 = num2.ToString();
    str4 = str4.Substring(2, 2);
    str4 = Convert.ToString((int) (Convert.ToChar(str4.Substring(0, 1)) - '0')).Substring(Convert.ToString((int) (Convert.ToChar(str4.Substring(0, 1)) - '0')).Length - 1, 1) + Convert.ToString((int) (Convert.ToChar(str4.Substring(1, 1)) - '0')).Substring(Convert.ToString((int) (Convert.ToChar(str4.Substring(1, 1)) - '0')).Length - 1, 1);
    if (str5 != str4)
    {
        
        
    }
		Console.WriteLine("str5 : "+str5);	
      Console.WriteLine("str4 : "+str4);

}
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,14 sec, absolute running time: 0,09 sec, cpu time: 0,08 sec, average memory usage: 17 Mb, average nr of threads: 3