refactored project structure

src/day09/part09a.rs

@@ -0,0 +1,19 @@
+use std::ops::Add;
+
+pub fn solve(puzzle: String) -> u64 {
+    let mut solution: u64 = 0;
+
+    let points = puzzle
+        .lines()
+        .map(|line| line.split_once(',').unwrap())
+        .map(|(left, right)| (left.parse::<u64>().unwrap(), right.parse::<u64>().unwrap()))
+        .collect::<Vec<(u64, u64)>>();
+
+    points.iter().enumerate().for_each(|(i, point1)| {
+        points.iter().skip(i).for_each(|point2| {
+            solution = solution.max(point1.0.abs_diff(point2.0).add(1) * point1.1.abs_diff(point2.1).add(1));
+        })
+    });
+
+    solution
+}