extract fetching a feed into a function

go/feeds/feeds.go

	fmt.Printf("fetching %d feeds...\n", len(*feeds))
	for _, fn := range *feeds {
		fmt.Printf("fetching %s\n", fn)
		fu, err := GetFeedUrl(fn)
		if err != nil {
			fmt.Println(err)
			continue
		}
		fn = fu
		f, err :=  feed.Fetch(fn)
		f, err := Fetch(fn)
		if err != nil {
			fmt.Println(err)
			continue
	}
}
func Fetch(fn string) (*feed.Feed, error) {
	fu, err := GetFeedUrl(fn)
	if err != nil {
		return nil, err
	}
	fn = fu
	f, err :=  feed.Fetch(fn)
	if err != nil {
		return nil, err
	}
	return f, nil
}
func GetFeedUrl(u string) (string, error) {
	resp, err := http.Get(u)
	if err != nil {