def human_string(text: str) -> str:
    """
    Transform text to human string

    Args:
        text: string to be converted
    Returns:
        converted string
    Examples:
        >>> human_string('test_str')
        'Test Str'
        >>> human_string("")
        ''
    """
    if not text:
        return ""
    return ' '.join(word.title() for word in text.split('_'))