Given a time in 12-hour AM/PM format, convert it to military (24-hour) time.
Note:
- 12:00:00AM on a 12-hour clock is 00:00:00 on a 24-hour clock.
- 12:00:00PM on a 12-hour clock is 12:00:00 on a 24-hour clock.
string: the time in 24-hour format
A single string that represents a time in 12-hour clock format (i.e.: hh:mm:ssAM or hh:mm:ssPM).