USDT => USDC => AVAX, how can I do this swap by this SDK

[eastonqiu]

I know how to swap from A to B directly if the pool(A & B) exist.
but the pool not exist, but can use a best route, how can I do it.
For example USDT => USDC => AVAX

thanks.

[aUsABuisnessman]

uint c = a + b;
assert(c>=a & c>=b)