def crop_from_right(sequence_string, crop_length):
    """
    return a sequence string without last crop_length characters
    drops values at end ie chops off right side
    if crop_length > length sequence_string --> returns ""
    if crop_length <= 0 returns string
    """
    if (crop_length <= 0):
        return sequence_string

    seq_length = len(sequence_string)
    if (crop_length > seq_length):
        return ""

    return sequence_string[:-crop_length]