Deduplicating area in title

hack/tools/release/notes.go

@@ -444,6 +444,16 @@ func modifyEntryTitle(title string, prefixes []string) string {
 	return strings.ToUpper(string(entryWithoutTag[0])) + entryWithoutTag[1:]
 }
 
+// trimAreaFromTitle removes area from title to avoid duplication.
+func trimAreaFromTitle(title, area string) string {
+	titleWithoutArea := title
+	position := strings.Index(title, area+":")
+	if position != -1 {
+		titleWithoutArea = strings.TrimSpace(titleWithoutArea[position+len(area+":"):])
+	}
+	return titleWithoutArea
+}
+
 // generateReleaseNoteEntry processes a commit into a PR line item for the release notes.
 func generateReleaseNoteEntry(c *commit) (*releaseNoteEntry, error) {
 	entry := &releaseNoteEntry{}
@@ -501,6 +511,7 @@ func generateReleaseNoteEntry(c *commit) (*releaseNoteEntry, error) {
 	}
 
 	if *prefixAreaLabel {
+		entry.title = trimAreaFromTitle(entry.title, area)
 		entry.title = fmt.Sprintf("- %s: %s", area, entry.title)
 	} else {
 		entry.title = fmt.Sprintf("- %s", entry.title)