def prepend_path(*paths)
      path_values = Array(paths)
      path_values << ENV[path_key]

      separator = File::PATH_SEPARATOR || ":"
      path_values.join(separator)
    end
def prepend_path(*paths)
      path_values = Array(paths)
      path_values << ENV[path_key]

      separator = File::PATH_SEPARATOR || ":"
      path_values.join(separator)
    end
A PATH variable format string representing the current PATH with the
 given path prepended. The correct path separator
 for the platform is used to join the paths.

 @param [Array<String>] paths

 @return [String]