Fix #3: trim the puzzle guess and the solution before comparing them

Description

The user's guess and puzzle's solution are now trimmed before being compared.

Checklist

• I have added tests for functionality I added and/or changed
• I have changed the database schema
  • I have added migrations
• I have added the required changelog entries
• I have run my branch and ensured all functionality is still working as intended

Closes

#3 (closed)

src/main/java/nl/tudelft/pupple/service/PuzzleAttemptService.java

@@ -67,7 +67,7 @@ public class PuzzleAttemptService {
 
 		guessObject = guessRepository.save(guessObject);
 		attempt.getGuesses().add(guessObject);
-		if (attempt.getPuzzle().getSolution().toLowerCase().equals(guess.toLowerCase())) {
+		if (attempt.getPuzzle().getSolution().trim().equalsIgnoreCase(guess.trim())) {
 			attempt.setSolved(true);
 		}
 		puzzleAttemptRepository.save(attempt);