def get_tarball_valid_unpack_directory_name(package_name: str, version_number: str) -> str:
    """
    get the name of the folder that should be obtained by unpacking the tarball
    :param package_name: name of the package to check
    :param version_number: version number
    :return: the name of the folder that is obtained by unpacking the tarball
    """
    return f"{package_name}_{version_number}"