pub type DayRunner = #(PartRunner, PartRunner)
pub type PartRunner = fn(String) -> Int
pub type RunnerMap = Map(Day, DayRunner)
pub const days_dir: String = "src/days/"
pub const input_dir: String = "input/"
pub fn build_from_days_dir() -> Result( Map(Int, #(fn(String) -> Int, fn(String) -> Int)), Snag, )