fixed same extentions space on root level

feed_test.go

@@ -81,7 +81,7 @@ func Test_Extensions(t *testing.T) {
 	feed := New(1, true, chanHandler, itemHandler)
 	feed.FetchBytes("http://example.com", content, nil)
 
-	extension := feed.Channels[0].Items[0].Extensions["http://www.sec.gov/Archives/edgar"]
+	extension := feed.Channels[0].Items[0].Extensions["http://www.sec.gov/Archives/edgar"][0]
 
 	companyExpected := "Cellular Biomedicine Group, Inc."
 	companyName := *extension.Childrens[0]

item.go

@@ -24,7 +24,7 @@ type Item struct {
 	Contributors []string
 	Content      *Content
 
-	Extensions map[string]*Extension
+	Extensions map[string][]*Extension
 }
 
 func (i *Item) Key() string {

rss.go

@@ -182,11 +182,11 @@ func (this *Feed) readRss2(doc *xmlx.Document) (err error) {
 			}
 
 			tl = item.SelectNodes("*", "*")
-			i.Extensions = make(map[string]*Extension)
+			i.Extensions = make(map[string][]*Extension)
 			for _, lv := range tl {
 				e, ok := getExtension(lv)
 				if ok {
-					i.Extensions[lv.Name.Space] = e
+					i.Extensions[lv.Name.Space] = append(i.Extensions[lv.Name.Space], e)
 				}
 			}
 
@@ -202,6 +202,7 @@ func getExtension(node *xmlx.Node) (*Extension, bool) {
 		var extension Extension
 		extension = Extension{Name: node.Name.Local, Value: node.GetValue()}
 		extension.Attrs = make(map[string]string)
+
 		for _, x := range node.Attributes {
 			extension.Attrs[x.Name.Local] = x.Value
 		}