@NotNull
  private static Couple<String> getFileNamesFromGitHeaderLine(@NotNull String path1, @NotNull String path2) {
    return Couple.of(getFileNameFromGitHeaderLine(path1, true),
                     getFileNameFromGitHeaderLine(path2, false));
  }
@NotNull
  private static Couple<String> getFileNamesFromGitHeaderLine(@NotNull String path1, @NotNull String path2)