ExamEd

import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;


public class newTwo {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        Map<String, StringBuilder> book = new HashMap<>();
        String[] notes = scanner.nextLine().split(" \\| ");

        for (String note : notes) {
            String[] data = note.split(": ");
            String word = data[0];
            String def = data[1];

            book.putIfAbsent(word, new StringBuilder());

// NOTE!
// System.lineSeparator() runs on all systems effectively, whereas the "\n" might interfere with other systems like Linux

//removed the ".append(" -")" as we can do it on the printing instead
// replaced the System.lineSeparator() with "\n",
            book.get(word).append(def).append("\n"); // now we just append the "def" String variable in the StringBuilder
// adding "\n" -> ensuring new info related to a Title ( word ) is on a new line
//   book.get(word).append(" -").append(def).append(System.lineSeparator());
        }

        notes = scanner.nextLine().split(" \\| ");
        String command = scanner.nextLine();

// you can still use the below boolean variable for the if on line 49 - if you think it's no longer confusing
// boolean isExamTime = "Test".equals(command);
//  if("Test".equals(command)) ->  if(isExamTime){


        for (String currentTopic : notes) {

// renamed to topicFromBook as its more accurate
// replaced the System.lineSeparator() with "\n",
            String topicFromBook = "\n" + book.get(currentTopic);
//String topicFromBook = System.lineSeparator() + book.get(currentTopic);

//split the ternary operator into an if else if statement
//System.out.print(isExamTime ? currentTopic + ":" + topicFromBook : currentTopic + " ");

            if (book.containsKey(currentTopic)) {
// first we have to check our book with past notes if it contains the particular topic(s) our teacher is asking us
                if("Test".equals(command)){
                    System.out.println(currentTopic + (":") + (" -") +  topicFromBook);
                } else if ("Hand Over".equals(command)){
                    System.out.println(currentTopic + " ");
                }
// print only the topics saved in your book in the order being asced depending on whether is an:
//    1. exam  -> print  everything "Title(s)" ( word ) and Paragraph(s) ( def )
//    2. brief check  -> print only the "Title(s)" ( word )
            }
        }
    }
}