Routes.swift

public func routes(_ router: Router) throws {
    
    let uCtrller = UserController()
    let usersRouter = router.grouped("api","users")
    usersRouter.get("subscribetopics",Int.parameter, use: uCtrller.getSubscribeTopics)
    usersRouter.post(SiblingPair.self, at: "subscribe", use: uCtrller.subscribe)  
  
    let tpCtrller = TopicController()
    let topicsRouter = router.grouped("api","topics")
    topicsRouter.get("subscribers",String.parameter, use: tpCtrller.getTopicSubscriber)
}