code: function (path) {
                  var absolute = path.charAt(0) === '/', trailingSlash = path.slice(0 - 1) === '/';
                  path = normalizeArray(splitPathToArray(path), !absolute).join('/');
                  if (!path && !absolute) {
                      path = '.';
                  }
                  if (path && trailingSlash) {
                      path += '/';
                  }
                  return (absolute ? '/' : '') + path;
              }
docs: normalize .. and . in path
  @param {String} path Path tobe normalized
  
  
  'x/y/../z' => 'x/z'
  'x/y/z/../' => 'x/y/'
  
  @return {String}