private static String addPrefix(@NotNull String name, @Nullable String prefix, boolean addTrailingSlash) {
    String pref = prefix == null ? "" : prefix;
    pref += name;
    if (addTrailingSlash) {
      pref += "_";
    }
    return pref;
  }
private static String addPrefix(@NotNull String name, @Nullable String prefix, boolean addTrailingSlash)