@@ -143,7 +143,7 @@ func (l *tarexporter) Load(ctx context.Context, inTar io.ReadCloser, outStream i

 		if err != nil {

 			return err

 		}

-		imageIDsStr.WriteString(fmt.Sprintf("Loaded image ID: %s\n", imgID))

+		fmt.Fprintf(&imageIDsStr, "Loaded image ID: %s\n", imgID)

 		imageRefCount = 0

 		for _, repoTag := range m.RepoTags {

@@ -158,7 +158,7 @@ func (s *Server) help(w http.ResponseWriter, r *http.Request) {

 	var result strings.Builder

 	s.mu.Lock()

 	for path := range s.handlers {

-		result.WriteString(fmt.Sprintf("%s\n", path))

+		fmt.Fprintf(&result, "%s\n", path)

 	}

 	s.mu.Unlock()

 	_, _ = HTTPReply(w, CommandSucceed(&StringCmd{Info: result.String()}), jsonOutput)

@@ -84,7 +84,7 @@ type TableObj struct {

 func (t *TableObj) String() string {

 	var output strings.Builder

-	output.WriteString(fmt.Sprintf("total entries: %d\n", t.Length))

+	fmt.Fprintf(&output, "total entries: %d\n", t.Length)

 	for _, e := range t.Elements {

 		output.WriteString(e.String())

 	}