CECS 453 Lab Assignment #5 video redo

Hello, i'm redoing my lab #5 for my CECS 453 (Mobile Application Development) class at CSULB. In this video, i'm implementing the ViewModel component, navigation (routes and NavHostController) to navigate between screens, make the app bar respond to navigation with my new screens because clicking on the Up button will do this and the previous data should still be there when i (user) navigate back to my ordered screen. My code shows how to search a product, order a product, show the final order and click the up button to navigate to the home screen.