fn timeConversion(s: &str) -> String {
    let prefix = &s[8..10];
    let hour_slc = &s[0..2];
    let minutes = &s[3..5];  
    let seconds = &s[6..8]; 
    let hour_num: i32 = hour_slc.parse().unwrap();
    
    match prefix {
        "AM" => {
            if hour_num == 12 {
               format!("00:{}:{}", minutes, seconds) 
            } else {
             format!("{:02}:{}:{}", hour_num, minutes, seconds)
            }
        },
        "PM" => {
            if hour_num == 12 {
               format!("12:{}:{}", minutes, seconds) 
            } else {
              let convert_hour = hour_num + 12;
              format!("{:02}:{}:{}", convert_hour, minutes, seconds)
            }
        },
        _ => "00:00:00".to_string()
    }
}