code: public function generate($type, $config, $hash)
      {
          return $type . '/' . $config . '/' . $this->hash($hash) . '/' . $hash;
      }
docs: <type>(/<config>)/<hash>{s1}/<hash>{s2}/<hash>
  
  @param string $type
  @param string $hash
  @param string $config
  
  @return string