Military time code coach can't pass hidden cases

Question

i don't know what's wrong with my code that the hidden cases failing.
https://code.sololearn.com/cEWy8g0bFh5v/#c

Answer 1

Sometimes it cuts the first two digits:

04:15 AM
output: :15
expected: 04:15

Answer 2

Please always tag the language you're asking about.
https://code.sololearn.com/W3uiji9X28C1/?ref=app

Answer 3

I made this code my way if you would like to benefit from it.

https://code.sololearn.com/cyxNID0dl4CB/#c