src/main/java/board/Board.java
public List<Note> notes(Topic topic) {
    if (!topics.containsKey(topic)) {
      return new ArrayList<>();
    }
    return new ArrayList<>(topics.get(topic));
  }
/** notes returns a copy of the Notes for the Topic. */
notes returns a copy of the Notes for the Topic.
notes returns a copy of the Notes for the Topic .
public List<Note> notes(Topic topic) {
    if (!topics.containsKey(topic)) {
      return new ArrayList<>();
    }
    return new ArrayList<>(topics.get(topic));
  }
public List < Note > notes ( Topic topic ) { if ( ! topics . containsKey ( topic ) ) { return new ArrayList < > ( ) ; } return new ArrayList < > ( topics . get ( topic ) ) ; }
notes returns a copy of the Notes for the Topic.
notes returns a copy of the Notes for the Topic .