code: public function generate()
  	{
  		if (TL_MODE == 'BE')
  		{
  			$objTemplate = new BackendTemplate('be_wildcard');
  			$objTemplate->wildcard = '### ' . Utf8::strtoupper($GLOBALS['TL_LANG']['FMD']['logout'][0]) . ' ###';
  			$objTemplate->title = $this->headline;
  			$objTemplate->id = $this->id;
  			$objTemplate->link = $this->name;
  			$objTemplate->href = 'contao/main.php?do=themes&amp;table=tl_module&amp;act=edit&amp;id=' . $this->id;
  
  			return $objTemplate->parse();
  		}
  
  		// Set last page visited
  		if ($this->redirectBack)
  		{
  			$_SESSION['LAST_PAGE_VISITED'] = $this->getReferer();
  		}
  
  		$strLogoutUrl = System::getContainer()->get('security.logout_url_generator')->getLogoutUrl();
  		$strRedirect = Environment::get('base');
  
  		// Redirect to last page visited
  		if ($this->redirectBack && !empty($_SESSION['LAST_PAGE_VISITED']))
  		{
  			$strRedirect = $_SESSION['LAST_PAGE_VISITED'];
  		}
  
  		// Redirect to jumpTo page
  		elseif (($objTarget = $this->objModel->getRelated('jumpTo')) instanceof PageModel)
  		{
  			/** @var PageModel $objTarget */
  			$strRedirect = $objTarget->getAbsoluteUrl();
  		}
  
  		$uri = Http::createFromString($strLogoutUrl);
  
  		// Add the redirect= parameter to the logout URL
  		$query = new Query($uri->getQuery());
  		$query = $query->merge('redirect=' . $strRedirect);
  
  		$this->redirect((string) $uri->withQuery((string) $query));
  
  		return '';
  	}
docs: Logout the current user and redirect
  
  @return string