I participated in Advent of Code challenge this year (2021). For those unfamiliar with this its a series of 25 coding challenges, each released on next day from 1st to 25th of December. For completing each you get a star and bragging rights in front of your colleagues :).
https://adventofcode.com/2021/about
For those who like moving pictures, there is a Youtube video from the creator and maintainer of Advent of Code. Quite funny.
I implemented 20 and half days in Kotlin language to brush up on my Kotlin skills. Learned a lot and quite a lot of fun, but in the end I got burned out and did not finish the last 4 and half days.
https://github.com/MavoCz/advent-of-code
I started to like Kotlin :heart: