[rs] Move 2022_01 solution to y2022 module

rs/src/y2022/d01.rs

@@ -0,0 +1,23 @@
+pub fn solve(input: String) -> anyhow::Result<()> {
+    let mut elves = input
+        .trim()
+        .split("\n\n")
+        .map(|chunk| {
+            chunk
+                .split('\n')
+                .map(|n| n.parse::<u32>().unwrap())
+                .sum::<u32>()
+        })
+        .collect::<Vec<_>>();
+    elves.sort_unstable();
+
+    // Part 1
+    let top = elves.last().unwrap();
+    println!("Part 1: {top}");
+
+    // Part 2
+    let top_three = elves.iter().rev().take(3).sum::<u32>();
+    println!("Part 2: {top_three}");
+
+    Ok(())
+}