code: public function register()
      {
          $this->mergeConfigFrom($this->getConfigSource(), 'purifier');
          
          $this->app->singleton('purifier', function (Container $app) {
              return new Purifier($app['files'], $app['config']);
          });
  
          $this->app->alias('purifier', Purifier::class);
      }
docs: Register the service provider.
  
  @return void