is it correct ? Write a function to change all the upper case to lower case in a given string. Answer: #include #include using namespace std;   string toLowerCase(string str) {     for (char& c : str) {                 if (isupper(c)) {                     c = tolower(c);         }     }     return str; } int main() {     string str = "HI, MY NAME IS KHALED MOHAMMED!";     cout << toLowerCase(str) << endl;     return 0;

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