code: private function normalizePath($path)
      {
          $path = \array_filter(\preg_split('#[\./]#', $path), 'strlen');
          if (\count($path) == 0 || $path[0] == '*') {
              return '';
          }
          $configKeys = $this->getConfigKeys();
          $found = false;
          foreach ($configKeys as $objName => $objKeys) {
              if (\in_array($path[0], $objKeys) && $objName !== 'debug') {
                  $found = true;
                  \array_unshift($path, $objName);
                  break;
              }
              if ($path[0] == $objName && !empty($path[1])) {
                  $found = true;
                  break;
              }
          }
          if (!$found) {
              // we didn't find our key... assume debug
              \array_unshift($path, 'debug');
          }
          if (\end($path) == '*') {
              \array_pop($path);
          }
          return \implode('/', $path);
      }
docs: Normalize string path
  Returns either
  ''         empty string = all config values grouped by class
  '{class}'         we want all config values for class
  '{class}/{key}    want specific value from this class'
  {class} may be debug
  
  @param string $path string path
  
  @return string