An attack is always successful, and decreases the opponent’s current_hp by the given number of points. monsters continue taking turns until one of them reaches current_hp less than or equal to 0, at which point the win_fight and lose_fight methods should be invoked. once the fight is complete, return the round number in which the fight ended, the monster that won and the list of attacks the winning monster used. if both monsters only have "wait" as an attack, return -1, none, non