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