func (s *service) progress(e exploration.Exploration, eventTime time.Time) (exploration.Exploration, error) {
var err error
if e.IsNextFloor() {
e, err = s.nextFloor(e, eventTime)
} else {
e, err = s.event(e, eventTime)
}
if err != nil {
return e, err
}
return e, nil
}
