Rust pop-answer: trade-path-walker

Answer to the Rust pop-quiz: trade-path-walker.

Say I want to trade $axlUSDC to $axlUSDC using this path:

axlUSDC,USK,ATOM,KUJI,axlUSDC

How much do I make?

According to ./efficacy:

100 tokens becomes 108.079475.

Source of improved_efficacy.rs