code: func (f *Feed) GetEventURLs() ([]string, error) {
  	s := make([]string, len(f.Entry))
  	for i := 0; i < len(f.Entry); i++ {
  		e := f.Entry[i]
  		s[i] = strings.TrimRight(e.Link[1].Href, "/")
  	}
  	return s, nil
  }
docs: // GetEventURLs extracts a slice of event urls from the feed object.