func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     ;     int n, k;     cin >> n >> k;     string s, s1;     cin >> s;     if (k == 0) {       cout << s;     } else if (n == 1) {       cout << 0 <<   n ;     } else {       if (s[0] !=  1 ) {         k--;       }       s1.push_back( 1 );       int i = 1;       while (k && i < n) {         if (s[i] !=  0 ) k--;         s1.push_back( 0 );         i++;       }       for (; i < n; i++) {         s1.push_back(s[i]);       }       cout << s1 <<   n ;     }     return 0;   }   