def find_template(repo_dir: Path | str, env: Environment) -> Path:
    """Determine which child directory of ``repo_dir`` is the project template.

    :param repo_dir: Local directory of newly cloned repo.
    :return: Relative path to project template.
    """
    logger.debug('Searching %s for the project template.', repo_dir)

    for str_path in os.listdir(repo_dir):
        if (
            'cookiecutter' in str_path
            and env.variable_start_string in str_path
            and env.variable_end_string in str_path
        ):
            project_template = Path(repo_dir, str_path)
            break
    else:
        raise NonTemplatedInputDirException

    logger.debug('The project template appears to be %s', project_template)
    return project_template
Determine which child directory of ``repo_dir`` is the project template.

    :param repo_dir: Local directory of newly cloned repo.
    :return: Relative path to project template.
    
cookiecutter/find.py