Advent of code in Rust - solving year 2020 exercise 21

In this episode, we started and completed Advent of Code y2020 ex21!

This was relatively easy compared to the previous exercise!

In this episode we had to identify ingredients with allergens from a list of ingredients in a foreign language.

Our solution was heavily based on hashmaps and hashsets. We also got to use a lot of iterators combinator functions and custom sorting!

Maybe this one was really easy but it felt like we are getting better (and faster) at Rust! Hooray!

For all the source code check out the official GitHub repo: https://github.com/lmammino/rust-advent

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