def gen_un_ordered_list(list_items, bullet_char='*'):
    """Generates a bullet list.

    The bullet character can be provided.

    Args:
     list_items (list of strings): The items to be listed.
     bullet_char (char, optional): The bullet character '*'
       is default.

    Returns:
      string: The markdown formatted list.

    """
    md_str = ''
    for item in list_items:
        md_str += '{} {}\n'.format(bullet_char, item)
    return md_str
