Update LICENSE

Forgot that the default license provided by Gitea is a template and needs to be filled out *facepalm*

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) <year> <owner> 
+Copyright (c) 2022, apio 
 
 Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
 

src/input.txt

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src/main.rs

@@ -1,3 +1,76 @@
-fn main() {
+// https://adventofcode.com/2022/day/3
-    println!("Hello, world!");
+#![feature(iter_array_chunks)]
+
+const DATA: &'static str = include_str!("input.txt");
+
+fn item_priority(item: char) -> u8
+{
+    if item.is_lowercase() {
+        ((item.to_ascii_lowercase() as u8) - ('a'.to_ascii_lowercase() as u8)) + 1
+    } else {
+        ((item.to_ascii_uppercase() as u8) - ('A'.to_ascii_uppercase() as u8)) + 27
+    }
 }
+
+#[allow(dead_code)]
+fn part1()
+{
+    let mut priority_sum = 0;
+    for slice in DATA.split("\n")
+    {
+        if slice.is_empty() { continue; }
+
+        let (left, right) = slice.split_at(slice.len() / 2);
+
+        for c in left.chars().into_iter()
+        {
+            if right.contains(c)
+            {
+                priority_sum += item_priority(c) as u32;
+                break;
+            }
+        }
+    }
+    println!("The sum of the priorities of duplicate item types is {}", priority_sum);
+}
+
+fn part2()
+{
+    let mut priority_sum = 0;
+    for slice in DATA.split("\n").array_chunks::<3>()
+    {
+        let left = slice[0];
+        let mid = slice[1];
+        let right = slice[2];
+
+        for c in left.chars().into_iter()
+        {
+            if mid.contains(c) && right.contains(c)
+            {
+                priority_sum += item_priority(c) as u32;
+                break;
+            }
+        }
+    }
+    println!("The sum of the priorities of team badges is {}", priority_sum);
+}
+
+fn main()
+{
+    //part1()
+    part2()
+}
+
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_item_priority() {
+        assert_eq!(item_priority('a'), 1);
+        assert_eq!(item_priority('z'), 26);
+        assert_eq!(item_priority('A'), 27);
+        assert_eq!(item_priority('Z'), 52);
+    }
+}