toggleFavorite method
Changes favourite status of exercise to the opposite of current status.
Implementation
Future<void> toggleFavorite({
required String email,
required String exerciseName,
required bool isCurrentlyFavorite,
}) async {
if (isCurrentlyFavorite) {
await removeFavorite(email, exerciseName);
} else {
await addFavorite(email, exerciseName);
}
}