message: Chg: Move join to another block
diff: @@ -151,9 +151,9 @@ export class DownloadController {
  async createFileHash(courseName: string, userId: string) {
  const data = [
  courseName, userId, Date.now()
  - ];
  + ].join();
  - return crypto.createHash('sha1').update(data.join()).digest('hex');
  + return crypto.createHash('sha1').update(data).digest('hex');
  }
  /**
  