Add day helper

CHECKPOINT

2022/src/bin/dayXX.rs.tmpl

@@ -0,0 +1,11 @@
+const INPUT: &str = include_str!("../../input/dayXX.txt");
+
+fn main() {
+    println!("{}", part1(INPUT));
+}
+
+fn part1(input: &str) -> usize {
+    for line in input.split('\n').filter(|l| !l.is_empty()) {
+       todo!()
+    }
+}