@Contract("null -> null;!null -> !null")
  public static @Nullable String addRefsHeadsPrefixIfNeeded(@Nullable String branchName) {
    if (branchName != null && !branchName.startsWith(REFS_HEADS_PREFIX)) {
      return REFS_HEADS_PREFIX + branchName;
    }
    return branchName;
  }
@Contract("null -> null;!null -> !null")
  public static @Nullable String addRefsHeadsPrefixIfNeeded(@Nullable String branchName)