Advent of Code - Day 4

Yesterday I finished Day 4 of the 2025 Advent of Code. I've been keeping a Reflections section of the README.md for each day - and while doing this challenge I kept a strong focus on modelling the problem rather than the solution or implementation.

By that I mean: yes, it's all string and character manipulation - but aliasing data and operations behind classes and methods that make "sense" allowed me to think and reason about the work more clearly.

I think I'm at about a week of using Ruby nearly every day. Which is pretty cool!

My full reflections at the repo

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