Where can I find the ERC bridge contracts?

I am a dev working with Blue0x (an NXT clone). I am looking at building a DEX to integrate the Blue0x chain with Ethereum and Polygon. I found this tutorial but am not able to find contract/src/test/resources/test_contract_config.json. I wanted to try and make them work with our chain. Any help would be greatly appreciated.

Thank you.

here is the json you ask about: Bitbucket

Thank You