formatTask not working

[jiayushe]

main/src/main/java/seedu/algobase/ui/PlanCard.java

Lines 52 to 57 in dbd4b1c

	private void formatTasks(Plan plan) {
	plan.getTasks().stream()
	.sorted(Comparator.comparing(Task::getDateTime))
	.forEach(task -> tasks.getChildren().add(new Label(task.getProblem().toString() + '\n'
	+ task.getIsSolved().toString() + '\n' + task.getDateTime().toString())));
	}