Help me in solving WORDLE problem

My issue

My code

using System;

public class Test
{
	public static void Main()
	{
		// your code goes here
	}
}

Problem Link: WORDLE Problem - CodeChef

Hey this problem’s solution is easy. At first, let’s try to understand the problem. We are given two strings. 1st example: '“ABCDE” and the 2nd one is “EDCBA” . Now, we will match the characters located at the same index. If they are similar, we’ll change it with ‘G’. Here, index [0] = ‘A’, doesn’t match with 2nd string’s index[0] =‘E’. Replace it with ‘B’. Now, for code, we’ll take a new string containing five characters. And will replace the characters with a ‘G’ or ‘B’.

include <bits/stdc++.h>

using namespace std;

int main()
{

int t;
cin>>t;

while(t--)
{
    string s,z;

    cin>>s>>z;

    string m="CCCCC";

    for(int i=0;i<5;i++)
    {

            if(s[i]==z[i])

               m[i] = 'G';

            else if (s[i] != z[i])

                m[i]='B';
    }
    cout<<m<<endl;
}

}

type or paste code here