func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     int t, x;     cin >> t;     for (int i = 0; i < t; i++) {       string s;       cin >> s >> x;       bool possible = true;       for (int j = 0; j < s.size(); j++) {         if (s[j] ==  1 ) {           possible = false;           if (j > x - 1) {             if (j < 2 * x or s[j - 2 * x] ==  1 ) possible = true;           }           if (j < s.size() - x) {             if (j > (int)s.size() - 2 * x - 1 or s[j + 2 * x] ==  1 )               possible = true;           }           if (!possible) {             break;           }         }       }       if (!possible) {         cout << -1 <<   n ;       } else {         for (int j = 0; j < s.size(); j++) {           if ((j > x - 1 and s[j - x] ==  0 ) or               (j < s.size() - x and s[j + x] ==  0 )) {             cout << 0;           } else {             cout << 1;           }         }         cout <<   n ;       }     }   }   