This is part 2 of a demo for arbitrage trading. This part is trying to scan for best routes between 2 currencies (that may or may not involve other currencies), and check if the forward (from A to B) and backward (from B to A) trading would form profitable arbitrage attack.

• Get related Pancakeswap V2 / V3 pools - the pools that involve either token A or B - and check trading routes from A to B, that may be direct exchange pool or a route that involve one more token.
• Keep checking best forward / backward trading route using SmartRouter.findBestTrade, and see if any profitable attack can be performed.

The scan take too long to form an attack and perform that before next block is committed. It is still useful to find potential trade routes. Another approach is implemented in part 3. https://github.com/wwboy6/arbitrage-trading2