refactored project structure

src/day01/part01a.rs

@@ -0,0 +1,20 @@
+
+pub fn solve(puzzle: String) -> u64 {
+    let mut solution: u64 = 0;
+
+    let mut dial: i32 = 50;
+    puzzle.split("\n").enumerate().for_each(|(_, line)| {
+        let direction: i32 = match &line[0..1] {
+            "L" => -1,
+            "R" => 1,
+            _ => 0,
+        };
+        dial += direction * line[1..line.len()].parse::<i32>().unwrap();
+        dial %= 100;
+        if dial == 0 {
+            solution += 1;
+        }
+    });
+
+    solution
+}