question: private Collection < IQuest > findCompletedQuests ( Player player ) { List < IQuest > res = new ArrayList < IQuest > ( ) ; for ( IQuest quest : quests ) { if ( quest . isCompleted ( player ) && quest . isVisibleOnQuestStatus ( ) ) { res . add ( quest ) ; } } return res ; }
target:  Find the quests that a player has completed.