add 01, 02

lib/aoc/Cargo.lock

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

lib/aoc/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "aoc"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

lib/aoc/src/lib.rs

@@ -0,0 +1,8 @@
+use std::{fs, io::Read};
+
+pub fn read_file(filename: &str) -> Vec<String> {
+    let mut f = fs::File::open(filename).unwrap();
+    let mut buffer = String::new();
+    f.read_to_string(&mut buffer).unwrap();
+    buffer.lines().map(|s| s.to_owned()).collect()
+}