htc_3_22.swift

func transform(
    newsReducer: @escaping (NewsState, NewsEvent) -> NewsState,
    stateKeyPath: WritableKeyPath<AppState, NewsState>
) -> Reducer {
    return { appState, appEvent in
        var appState = appState
        appState[keyPath: stateKeyPath] = newsReducer(appState[keyPath: stateKeyPath], appEvent)
        return appState
    }
}