amount cancellation

func updateCancellationAmount(db *gorm.DB, restaurantID uint) error {
	query := `
        UPDATE Restaurant
        SET CancellationAmount =
            CASE
                WHEN CancellationAmount = 0 THEN GREATEST(DinnerPriceMax, LunchPriceMax)
                ELSE CancellationAmount
            END
        WHERE id = ?;
    `
	if err := db.Exec(query, restaurantID).Error; err != nil {
		logging.Logger.Error("Error updating CancellationAmount", zap.Error(err))
		return err
	}

	return nil
}


if err := updateCancellationAmount(dbutil.DB(), body.ID); err != nil {
		return nil, http.StatusInternalServerError, err
	}