def create():
    b1 = {'open' : False, 'level' : 100}
    return b1

def is_open(bottle):
    return bottle['open']

def fill_level(bottle):
    return bottle['level']

def open(bottle):
    bottle['open'] = True

def close(bottle):
    bottle['open'] = False

def remove_liquid(bottle, amount):
    if not bottle['open'] or is_empty(bottle):
        return 0

    bottle['level'] -= amount
    return amount

def is_empty(bottle):
    return bottle['level'] <= 0