I ask for a helping hand, I need to rewrite the code from C ++ to C

#include <iostream>
#include <algorithm>
#include <string>
using namespace std;
void main() {
char L[] = ",";
int k = 0;
setlocale(LC_ALL, "ru");
string S{};
getline(cin, S);
for (int i = 0; i < S.size(); i++) {
if (S[i] == L[0]) {
k++;
}
}
replace(S.begin(), S.end(), ',', '!');
cout << S<<endl;
cout << k;
}

C

#include <iostream>

#include <algorithm>

#include <string>

using namespace std;

void main() {

    char L[] = ",";

    int k = 0;

    setlocale(LC_ALL, "ru");

    string S{};

    getline(cin, S);

    for (int i = 0; i < S.size(); i++) {

        if (S[i] == L[0]) {

            k++;

        }

    }

    replace(S.begin(), S.end(), ',', '!');

    cout << S<<endl;

    cout << k;

}