npm install
Add .env file
Add 'session_id=' followed by your session id
npm run createToday will create a year folder of the current year if it does not exist, and a numbered day file '1.js' for that day if it does not exist inside that folder, along with some short template code
npm run createDay -- -y 2022 -d 7 will create a 2022 folder if it does not exist and a 7.js file inside that folder if it does not exist, along with some template code
node 2023/1.js to run a day.
When the template code inside a day file runs it checks whether an input file for that day exists, and fetches it from the Advent of Code site if it does not