day1: Extract input parsing to lib

src/bin/d1p1.rs

@@ -0,0 +1,8 @@
+use aoc22::day1;
+
+fn main() {
+    let elves = day1::read_elves();
+
+    let max = elves.iter().max().unwrap();
+    println!("The elf with the most calories is carrying {} cal", max);
+}