code: public static Path pathForRelativeFilepath(
              final String filepath,
              final String separator
      )
      {
          String[] comps = filepath.split(Pattern.quote(separator));
          return PathUtil.pathFromComponents(comps);
      }
docs: Return a storage path given a relative file path string
  
  @param filepath  file path with given separator
  @param separator separator string
  
  @return storage path