Third pair in swap

[CryptorClub]

Hello. Thank you for your work!

Can you direct me which files I need to modify to add third pair in trading?
like:
token - base | base - base | base - token
token - usdc | usdc - weth | weth - token

I see it should be:
generating pairs than
calculate trading with generated pairs
that trade through three pairs

Thank you for advice.