func getShortlinkFromLonglink(fromURL url: URL, completionHandler: @escaping (_ shortlink: String?) -> ()) {
        let parameters = ["longDynamicLink": url.absoluteString,
                          "suffix": ["option": "SHORT"]] as [String : Any]

        guard let url = URL(string: "https://firebasedynamiclinks.googleapis.com/v1/shortLinks?key=AIzaSyCAJztEvOtrkQ-zk5yTjvArR9i-Dqpj5_8") else {
            completionHandler(nil)
            return
        }

        let session = URLSession.shared

        var request = URLRequest(url: url)
        request.httpMethod = "POST"

        do {
            request.httpBody = try JSONSerialization.data(withJSONObject: parameters, options: .prettyPrinted)
        } catch let error {
            print(error.localizedDescription)
            completionHandler(nil)
            return
        }

        request.addValue("application/json", forHTTPHeaderField: "Content-Type")
        request.addValue("application/json", forHTTPHeaderField: "Accept")

        let task = session.dataTask(with: request as URLRequest, completionHandler: { data, response, error in

            guard error == nil, let data = data else {
                completionHandler(nil)
                return
            }

            do {
                if let json = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) as? [String: Any] {
                    completionHandler(json["shortLink"] as! String)
                }
            } catch let error {
                print(error.localizedDescription)
                completionHandler(nil)
                return
            }
        })
        task.resume()
    }