func_code_string: #include <bits/stdc++.h>   using namespace std;   void solve() {     long long int n;     string s;     cin >> n >> s;     for (long long int i = 0; i < n; i++) cout << s[n - 1];     cout << endl;   }   int main() {     int test;     cin >> test;     for (int TEST = 1; TEST <= test; TEST++) solve();   }   