moved code around so each year is a package.

2021/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name="aoc2021"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+core = { path = "../core" }

2021/src/bin/2021_01a.rs

@@ -0,0 +1,26 @@
+use core::read_data;
+
+fn dips(input: &str) -> u32 {
+    let mut last_reading = 0;
+    let mut counter = 0;
+    for line in input.lines() {
+        let current_reading: u32 = line.parse().unwrap();
+        if last_reading <= current_reading {
+            counter += 1;
+            println!("Increase from {} to {}", current_reading, last_reading);
+        }
+        last_reading = current_reading;
+    }
+    // first is always 0
+    counter -= 1;
+    println!("There were {counter} decreasing readings.");
+    counter
+}
+
+fn main() {
+    let binding = read_data("2021_01_data.txt");
+    let lines = binding;
+    println!("Test 1 -> {}", dips("199\n200\n208\n210\n200\n207\n240\n269\n260\n263"));
+//     println!("Found {}", dips(lines.as_str()));
+}
+// 1791

2021/src/bin/2021_02a.rs

@@ -0,0 +1,33 @@
+use core::read_data;
+
+enum CardinalDirection {
+    North,
+    East,
+    South,
+    West
+}
+
+fn main() {
+    let mut facing = CardinalDirection::North;
+    let (mut current_x, mut current_y) = (0u32, 0u32);
+    let binding = read_data("2021_02_data.txt");
+    let steps = binding.lines();
+    for step in steps {
+        let (direction, velocity) = step.split_once(" ").unwrap();
+        let velocity: u32 = velocity.parse().unwrap();
+        match direction {
+            "forward" => {
+                println!("Move forward {}", velocity);
+            },
+            "down" => {
+                println!("Move Down {}", velocity);
+            },
+            "up" => {
+                println!("Move UP {}", velocity);
+            },
+            _ => {
+                unreachable!("Invalid direction");
+            }
+        }
+    }
+}