def lsb (target, data):
    """
    Embeded data to LSB of target
    ex: target='101010', data='111', return '101111'
    :param target: string <binary>
    :param data: string <binary>
    :returns: string
    """
    s1 = str(target)
    s2 = str(data)

    # check if data can't insert in target
    if len(s2)>len(s1):
        return target

    # lenght of data to insert
    n = len(s2)

    # slice a target
    s1 = s1[:-n]
    return s1+s2