Advent of Code Part 2 Timer nga Marcela Errazquin

Advent of Code is an Advent calendar of small programming puzzles for a variety of skill sets and skill levels that can be solved in any programming language you like.

This inserts a new column on the personal stats page: https://adventofcode.com/<year>/leaderboard/self

Note: You must generate a private leaderboard in order for the extension to work. See: https://adventofcode.com/<year>/leaderboard/private