day 2 and revised day 1 with advantage of DoubleEndedIterator

src/utils/config.rs

@@ -1,7 +1,4 @@
-use std::{
-    env::var,
-    sync::OnceLock,
-};
+use std::{env::var, sync::OnceLock};
 
 static CONFIG: OnceLock<Config> = OnceLock::new();
 
@@ -9,13 +6,15 @@ pub struct Config {
     pub aoc_session: String,
 }
 
-impl Config { }
+impl Config {}
 
 fn get_var(var_name: &str) -> String {
     var(var_name).unwrap_or("".to_owned())
 }
 
 pub fn get_config() -> &'static Config {
-    let config = CONFIG.get_or_init(|| Config { aoc_session: get_var("AOC_SESSION") });
+    let config = CONFIG.get_or_init(|| Config {
+        aoc_session: get_var("AOC_SESSION"),
+    });
     config
 }

src/utils/mod.rs

@@ -1,3 +1,3 @@
+pub mod aoc;
 pub mod common;
 pub mod config;
-pub mod aoc;