Revert "Add the find method in dijkstra class, so you can invoke pathTo() method to return a path from src to dst"

This reverts commit 0ce41af7946a8a929ec4a50113aef91434a1fb81.
Revert "Revert "Add the find method in dijkstra class, so you can invoke pathTo() method to return a path from src to dst""

This reverts commit 6c13d4b750a2ba36178d8125c7e04cf97ab63300.