func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int T;     cin >> T;     while (T--) {       int S;       cin >> S;       string str;       cin >> str;       for (int i = 0; i < S; i++) cout << str[S - 1];       cout << endl;     }     return 0;   }   