Day 1 part 1 complete.

Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "aoc23"
+version = "0.1.0"

rustfmt.toml

@@ -0,0 +1 @@
+tab_spaces = 2

src/main.rs

@@ -1,3 +1,12 @@
+use std::io;
+
 fn main() {
-    println!("Hello, world!");
+  let mut buffer = String::new();
+  let mut sum = 0;
+  while io::stdin().read_line(&mut buffer).unwrap() > 0 {
+    let nums: Vec<u32> = buffer.chars().filter_map(|c| c.to_digit(10)).collect();
+    sum += nums.first().unwrap() * 10 + nums.last().unwrap();
+    buffer = String::new();
+  }
+  println!("Sum: {}", sum);
 }