Advent of Code (https://adventofcode.com/) solutions written in C, I'm so rusted
$ git clone https://github.com/setepenre/advent_of_code.git
$ cd advent_of_code/[year]
$ make
$ day_n/main path/to/day_n/input/file
$ cat path/to/day_n/input/file | day_n/main -