How to set default Locale {locale} on default redirected controller?

Hi all! I have an app that works ok in different languages but want to filter and fix on home URL to append locale as

PHP Code:

/*Filter class*/
    /*I get too many redirect error message*/
        $uri = &$request->uri;
        $segments = array_filter($uri->getSegments());
        $checkSegments = count($segments);

   //  the first 2 letters (en => en)
        $userLocale = strtolower(substr($request->getLocale(), 0, 2));

            $locale = in_array($userLocale, $request->config->supportedLocales) ? 
                                         $userLocale :
                                         $this->request->config->defaultLocale;

       if if ($checkSegments == 0)
        {
        return redirect()->to("/{$locale}");
        } 


I want if any incoming request should fall on eg: (www. example.com/en) and not (www. example.com)

PHP Code:

public function index(){
      return view('homepage');/*I want to fix in homepage should be appended with surport locale  = exapmple.com/{locale}*/
}
/* I get 404 error */
      $routes->get('/{locale}', 'HomePage::index',['filter'=>'locales']); /*get 404 error*/ 


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