code: protected function execute(InputInterface $input, OutputInterface $output)
      {
          $messages = [
              'info' => '<error>WARNING! This command involves a very high risk of data/file losses</error>',
              'skipping' => '<comment>Exiting</comment>',
              'question' => "<info>Are you sure you want to execute this command ? y/[n]</info>\n",
          ];
          if (!$this->askQuestion($input, $output, [true], $messages)) {
              return 0;
          }
  
          $executeAll = true;
          if ($input->getOption('delete-extra')
              || $input->getOption('delete-orphans')
              || $input->getOption('delete-missing')
          ) {
              $executeAll = false;
          }
  
          $this->computeFileSystemDifferences();
  
          if ($executeAll || $input->getOption('delete-extra')) {
              $this->executeDeleteExtra($input, $output);
          }
  
  //        if ($executeAll || $input->getOption('delete-missing')) {
  //            $this->executeDeleteMissing($input, $output);
  //        }
  
          if ($executeAll || $input->getOption('delete-orphans')) {
              $this->executeDeleteOrphans($input, $output);
          }
  
          if ($output->getVerbosity() >= OutputInterface::VERBOSITY_VERBOSE) {
              $output->writeln('<info>Success</info>');
          }
  
          return 0;
      }
docs: @param InputInterface  $input
  @param OutputInterface $output
  
  @throws \Exception
  
  @return int|null