code: public static function normalizeAccountNumber($account)
      {
          $account = str_replace(' ', '', $account);
          if (false === strpos($account, '-')) {
              $account = '000000-' . $account;
          }
          $parts = explode('-', $account);
          $parts[0] = str_pad($parts[0], 6, '0', STR_PAD_LEFT);
          $parts2 = explode('/', $parts[1]);
          $parts2[0] = str_pad($parts2[0], 10, '0', STR_PAD_LEFT);
          $parts2[1] = str_pad($parts2[1], 4, '0', STR_PAD_LEFT);
          $parts[1] = implode('/', $parts2);
  
          return implode('-', $parts);
      }
docs: Normalize account number
  
  @param string $account Account number
  @return string