feat: add custom not found route handler

internal/routes/notFound.go

@@ -0,0 +1,17 @@
+package routes
+
+import (
+	"net/http"
+
+	"github.com/Tibz-Dankan/keep-active/internal/services"
+	"github.com/gorilla/mux"
+)
+
+func notFound(w http.ResponseWriter, r *http.Request) {
+	message := "Endpoint " + "'" + r.URL.Path + "'" + " does not exist!"
+	services.AppError(message, 404, w)
+}
+
+func NotFoundRoute(router *mux.Router) {
+	router.NotFoundHandler = http.HandlerFunc(notFound)
+}

internal/routes/router.go

@@ -73,5 +73,8 @@ func AppRouter() *mux.Router {
 	// Monitor route
 	monitor.GetMetrics(router)
 
+	// Not found route
+	NotFoundRoute(router)
+
 	return router
 }