code: func RedirectSlashes(next http.Handler) http.Handler {
  	fn := func(w http.ResponseWriter, r *http.Request) {
  		var path string
  		rctx := chi.RouteContext(r.Context())
  		if rctx.RoutePath != "" {
  			path = rctx.RoutePath
  		} else {
  			path = r.URL.Path
  		}
  		if len(path) > 1 && path[len(path)-1] == '/' {
  			if r.URL.RawQuery != "" {
  				path = fmt.Sprintf("%s?%s", path[:len(path)-1], r.URL.RawQuery)
  			} else {
  				path = path[:len(path)-1]
  			}
  			http.Redirect(w, r, path, 301)
  			return
  		}
  		next.ServeHTTP(w, r)
  	}
  	return http.HandlerFunc(fn)
  }
docs: // RedirectSlashes is a middleware that will match request paths with a trailing
  // slash and redirect to the same path, less the trailing slash.
  //
  // NOTE: RedirectSlashes middleware is *incompatible* with http.FileServer,
  // see https://github.com/go-chi/chi/issues/343