class GithubSDK {
    public static func getGists(completion: @escaping GenericNetworkingCompletion<[Gist]>) {
    // response is array of objects
        GenericNetworking.requestJSON(baseURLString: "https://api.github.com", path: "/gists", method: .get, parameters: nil, headers: nil, completion: completion);
    }

    public static func getGistDetail(_ gistId: String, completion: @escaping GenericNetworkingCompletion<Gist>) {
        // response is an object
        let URLString = "https://api.github.com/gists/" + gistId
        GenericNetworking.getJSON(URLString: URLString, completion: completion)
    }
}

GithubSDK.getGists { (response) in
    switch response {
    case .success(let gists):
        print(gists.count)
        for gist in gists {
            print("gist id:\(gist.identifider)")
        }
    case .error(let error):
        print(error)
    }
}