func_code_string: #include <bits/stdc++.h>   using namespace std;   long long min(long long a, long long b) { return a < b ? a : b; }   int ceil(int a, int b) { return (a + b - 1) / b; }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     int n, k;     cin >> n >> k;     string s;     cin >> s;     if (!k) {       cout << s;       return 0;     }     if (s.length() == 1) {       cout << 0;       return 0;     }     int cnt = 0;     if (s[0] !=  1 ) s[0] =  1 , cnt++;     for (int i = 1; i <= s.length(); i++) {       if (cnt == k) break;       if (s[i] !=  0 ) s[i] =  0 , cnt++;     }     cout << s;   }   