how do i display the path that went through in the location

this is a shortest path calculation for route
and it only display the cost of the destination
but it didnt display the location(nodes) that went through to reach the destination
i need it to display the nodes which display the shortest path between 2 location/nodes
i cant understand how change it, help please
need in urgent
Main.txt
Route.txt
Route-Engine.txt
location.txt
connection.txt