solve day1 part2 with example input from inputs/day1_example.txt
rebar3 escriptize && _build/default/bin/aoc2021 day1 part1 example
solve day2 part1 with real input from inputs/day2.txt
rebar3 escriptize && _build/default/bin/aoc2021 day2 part1
rebar3 auto
aoc2021:solve(day5, part1, real).