Route::get('/', 'HomeController@index')->name('home');
Route::get('/showContent/{content}', 'HomeController@showContent');

Route::get('/{content?}', 'HomeController@index')->name('home');

public function index($slug)
{
    if ($slug != null) {
        $this->showContent($slug);
    } else {
        return view('layouts.frontend.content');
    }
}