protected function execute(InputInterface $input, OutputInterface $output)
{
$this->io->title($this->getDescription());
$this->io->text("removing articles\n");
$this->removeArticles();
$this->io->newLine(2);
$this->io->text("refresh journal and remove issues\n");
$this->removeIssues($input);
$this->io->newLine(1);
$this->io->text("refresh journal and remove journal totally");
$this->refreshJournal($input);
$this->em->remove($this->journal);
$this->em->flush();
$this->io->success('successfully removed journal');
}