simplify condition test for trailing /

@@ -575,12 +575,11 @@ func (p *ControllerRegistor) ServeHTTP(rw http.ResponseWriter, r *http.Request)
 		}
 		}
 		// pattern /admin   url /admin 200  /admin/ 200
 		// pattern /admin   url /admin 200  /admin/ 200
 		// pattern /admin/  url /admin 301  /admin/ 200
 		// pattern /admin/  url /admin 301  /admin/ 200
-		if requestPath[n-1] != '/' && len(route.pattern) == n+1 &&
-			route.pattern[n] == '/' && route.pattern[:n] == requestPath {
+		if requestPath[n-1] != '/' && requestPath+"/" == route.pattern {
 			http.Redirect(w, r, requestPath+"/", 301)
 			http.Redirect(w, r, requestPath+"/", 301)
 			goto Admin
 			goto Admin
 		}
 		}
-		if requestPath[n-1] == '/' && n >= 2 && requestPath[:n-2] == route.pattern {
+		if requestPath[n-1] == '/' && route.pattern+"/" == requestPath {
 			runMethod = p.getRunMethod(r.Method, context, route)
 			runMethod = p.getRunMethod(r.Method, context, route)
 			if runMethod != "" {
 			if runMethod != "" {
 				runrouter = route.controllerType
 				runrouter = route.controllerType