Apply format to C code

examples/model_integration.c

examples/modulo.c

examples/recurrence.c

examples/time_calculus.c

include/mtime_calendar.h

include/mtime_calendar360day.h

include/mtime_calendar365day.h

include/mtime_calendarGregorian.h

include/mtime_date.h

include/mtime_datetime.h

include/mtime_eventHandling.h

include/mtime_eventList.h

include/mtime_iso8601.h

include/mtime_julianDay.h

include/mtime_time.h

include/mtime_timedelta.h

include/mtime_utilities.h

src/kepler.c

src/mtime_calendar.c

src/mtime_calendar360day.c