initial framework

src/lib.rs

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+pub mod utils;
+
+pub mod problems;

src/main.rs

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+use taoc2023::problems::*;
+use taoc2023::utils::timeit;
+
+fn main() {
+    println!("== day 01 ==");
+    timeit(|| {
+        let res = day01::solution();
+        println!("solution: {res}");
+    });
+}

src/problems/day01/mod.rs

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+pub fn solution() -> String {
+    "<todo>".to_string()
+}

src/problems/mod.rs

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+pub mod day01;

src/utils/mod.rs

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+use std::time::SystemTime;
+
+pub fn timeit<F: Fn() -> T, T>(f: F) -> T {
+    let start = SystemTime::now();
+    let result = f();
+    let end = SystemTime::now();
+    let duration = end.duration_since(start).unwrap();
+    println!("duration: {} milliseconds", duration.as_millis());
+    result
+}