add 22

src/euler22/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "euler22"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

src/euler22/src/main.rs

@@ -0,0 +1,42 @@
+fn main() {
+    let mut sum = 0;
+    let names = read_sorted_names("0022_names.txt");
+    for (i, name) in names.into_iter().enumerate() {
+        sum += (i + 1) * get_name_value(&name);
+    }
+
+    println!("{sum}");
+}
+
+fn read_sorted_names(filename: &str) -> Vec<String> {
+    let content = std::fs::read_to_string(filename).unwrap();
+    let mut names: Vec<String> = content
+        .split(',')
+        .map(|n| {
+            n.chars()
+                .skip(1)
+                .take_while(|c| c.is_ascii_uppercase())
+                .collect()
+        })
+        .collect();
+    names.sort_unstable();
+    names
+}
+
+fn get_name_value(name: &str) -> usize {
+    name.as_bytes()
+        .iter()
+        .map(|c| (c - 64) as usize)
+        .sum::<usize>()
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::get_name_value;
+
+    #[test]
+    fn colin() {
+        let value = get_name_value("COLIN");
+        assert_eq!(value, 53);
+    }
+}