public static String timeConversion(String s) {
        
        // Raw
        int hours   = Integer.parseInt(s.substring(0, 2));
        int minutes = Integer.parseInt(s.substring(3, 5));
        int seconds = Integer.parseInt(s.substring(6, 8));
        
        int transformedHours = hours;
        if (s.contains("PM") && hours != 12) transformedHours = hours + 12;
        else if (s.contains("AM") && hours == 12) transformedHours = 0;
        else transformedHours = hours;
        
        String formattedHours = transformedHours < 10 ? "0" + transformedHours : String.valueOf(transformedHours);
        String formattedMinutes = minutes < 10 ? "0" + minutes : String.valueOf(minutes);
        String formattedSeconds = seconds < 10 ? "0" + seconds : String.valueOf(seconds); 
        
        return String.format(
            "%s:%s:%s",
            formattedHours,
            formattedMinutes,
            formattedSeconds);
    }