تحديات برمجيةالتحدي الثاني - حل التمرين الأول بلغة C++

#include <iostream>
#include <string>

std::string removeAll(std::string s1, std::string s2) {

    int L1 = s1.length();
    int L2 = s2.length();
    std::string newS = "";

    for (int i = 0; i < L1;)
    {
        if (i <= L1 - L2 && s1.substr(i, L2) == s2)
        {
            i += L2;
        }
        else
        {
            newS += s1[i];
            i += 1;
        }

    }

    return newS;
}

int main() {

    std::string text = "I like cats. I have one cat.";
    std::string keyword = "cat";
    std::string newText = removeAll(text, keyword);

    std::cout << "Before: " << text << "\n";
    std::cout << "After:  " << newText << "\n";

    char end; std::cin >> end;
    return 0;

}

Before: I like cats. I have one cat.
After:  I like s. I have one .