:param left:
    :param right:
    :param width:
    :param fillchar:
    :param min_padding_length: minimum padding length
    :return:

def edge_just(left, right, width, fillchar=' ', min_padding_length=1):
    """
    :param left:
    :param right:
    :param width:
    :param fillchar:
    :param min_padding_length: minimum padding length
    :return:
    """
    assert unicode_width(fillchar) == 1, 'fillchar must be single-width char'
    padding = fillchar * max(min_padding_length, width - unicode_width(left + right))
    return left + padding + right