if 'AM' in time str:
        time_str = time_str.replace('AM', '').strip()
        if time_str.startswith('12'):
            time_str = time_str.replace('12', '00')
    elif 'PM' in time str:

12 hour time below AM and PM:
    hour, minute = map(int, time_str.split(':'))
    if hour = 0:
        return f"12:{minute:02d} AM"
    elif hour < 12:
        return f"12:{minute:02d} PM"

time 12 hour = "2:30 PM"
time 24 hour = to 24 hour format(time 12 hour)