Added benchmarking

day_01/benches/part2.rs

@@ -0,0 +1,11 @@
+use criterion::{black_box, criterion_group, criterion_main, Criterion};
+
+use day_01::prelude::*;
+
+fn criterion_benchmark(c: &mut Criterion) {
+    let input = include_str!("../input.txt");
+    c.bench_function("part 2", |b| b.iter(|| part2(black_box(input))));
+}
+
+criterion_group!(benches, criterion_benchmark);
+criterion_main!(benches);