Using C++ Language.....

string timeConversion(string s) {

// Extract the period (AM/PM)
string period = s.substr(s.length() - 2);
// Extract the hour, minute, and second
int hour = stoi(s.substr(0, 2));
string minute_second = s.substr(2, 6);

// Convert based on AM/PM period
if (period == "AM") {
    if (hour == 12) {
        return "00" + minute_second; // Midnight case: 12 AM -> 00
    } else {
        return s.substr(0, 8);  // Keep the time as it is, remove AM/PM
    }
} else {  // PM case
    if (hour == 12) {
        return "12" + minute_second;  // Keep the time as it is for 12 PM
    } else {
        return to_string(hour + 12) + minute_second;  // Add 12 to PM times
    }
}

}