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// MARK: - Helper Functions
extension NotificationService {

    /// Use this function to download an image and present it in a notification
    ///
    /// - Parameters:
    ///   - url: the url of the picture
    ///   - completion: return the image in the form of UNNotificationAttachment to be added to the bestAttemptContent attachments eventually
    private func downloadImageFrom(url: URL, with completionHandler: @escaping (UNNotificationAttachment?) -> Void) {
        let task = URLSession.shared.downloadTask(with: url) { (downloadedUrl, response, error) in