Forgot to commit some files + small cleanup

src/main.rs

@@ -0,0 +1,24 @@
+use std::time::Instant;
+
+mod util;
+mod day1;
+
+fn main() {
+
+    let now = Instant::now();
+
+    let args: Vec<String> = std::env::args().collect();
+
+    let day_arg_idx = args.iter().position(|a| a == "-d");
+    if day_arg_idx.is_some() {
+        match args[day_arg_idx.unwrap() + 1].parse::<u8>().unwrap() {
+            1 => day1::solve(),
+            _ => println!("This day is not yet implemented")
+        }
+    } else {
+        // Solve all days:
+        day1::solve();
+    }
+
+    println!("Execution took {} μs", now.elapsed().as_micros());
+}