Extract helper for download request query params

There's a proper abstraction lurking close by, but I'm not convinced I'm seeing it.
Instead of jumping to conclusions, this extracts a cohesive helper method
which can be moved onto the abstraction once it's defined.

cmd/download.go

@@ -54,16 +54,6 @@ func runDownload(cfg config.Config, flags *pflag.FlagSet, args []string) error {
 		return err
 	}
 
-	track, err := flags.GetString("track")
-	if err != nil {
-		return err
-	}
-
-	team, err := flags.GetString("team")
-	if err != nil {
-		return err
-	}
-
 	identifier, err := downloadIdentifier(flags)
 	if err != nil {
 		return err
@@ -80,25 +70,10 @@ func runDownload(cfg config.Config, flags *pflag.FlagSet, args []string) error {
 		return err
 	}
 
-	uuid, err := flags.GetString("uuid")
+	req, err = addQueryToDownloadRequest(flags, req)
 	if err != nil {
 		return err
 	}
-	slug, err := flags.GetString("exercise")
-	if err != nil {
-		return err
-	}
-	if uuid == "" {
-		q := req.URL.Query()
-		q.Add("exercise_id", slug)
-		if track != "" {
-			q.Add("track_id", track)
-		}
-		if team != "" {
-			q.Add("team_id", team)
-		}
-		req.URL.RawQuery = q.Encode()
-	}
 
 	res, err := client.Do(req)
 	if err != nil {
@@ -269,6 +244,39 @@ func downloadIdentifier(flags *pflag.FlagSet) (string, error) {
 	return identifier, nil
 }
 
+func addQueryToDownloadRequest(flags *pflag.FlagSet, req *http.Request) (*http.Request, error) {
+	uuid, err := flags.GetString("uuid")
+	if err != nil {
+		return req, err
+	}
+	slug, err := flags.GetString("exercise")
+	if err != nil {
+		return req, err
+	}
+	track, err := flags.GetString("track")
+	if err != nil {
+		return req, err
+	}
+
+	team, err := flags.GetString("team")
+	if err != nil {
+		return req, err
+	}
+
+	if uuid == "" {
+		q := req.URL.Query()
+		q.Add("exercise_id", slug)
+		if track != "" {
+			q.Add("track_id", track)
+		}
+		if team != "" {
+			q.Add("team_id", team)
+		}
+		req.URL.RawQuery = q.Encode()
+	}
+	return req, nil
+}
+
 func setupDownloadFlags(flags *pflag.FlagSet) {
 	flags.StringP("uuid", "u", "", "the solution UUID")
 	flags.StringP("track", "t", "", "the track ID")