moved code around so each year is a package.

2023/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name="aoc2023"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+core = { path = "../core" }

2023/src/bin/2023_01a.rs

@@ -0,0 +1,39 @@
+use core::read_data;
+
+fn main() {
+    let mut running_total = 0;
+    let binding = read_data("2023_01_data.txt");
+    let lines = binding.lines();
+
+   // let lines = "1abc2\npqr3stu8vwx\na1b2c3d4e5f\ntreb7uchet".lines();
+
+    for line in lines {
+        let mut working_string = String::new();
+        for char in line.chars() {
+            if char.is_numeric() {
+                working_string.push(char);
+            }
+        }
+        // take first and last chars
+        let this_round: u32 =  match working_string.len() {
+            1 => {
+                let mut short = working_string.clone();
+                short.push(working_string.chars().next().unwrap());
+                short.parse().unwrap()
+            },
+            1 => working_string.parse().unwrap(),
+            _ => {
+                let last_char = working_string.len() - 1;
+                let mut short_string = String::new();
+                short_string.push(working_string.chars().next().unwrap());
+                short_string.push(working_string.chars().last().unwrap());
+                // println!("Unhandled ||{working_string}|| / {short_string}");
+                short_string.parse().unwrap()
+            }
+        };
+        running_total += this_round;
+        println!("{line:>50} found number {working_string:>10}\t{this_round}\t{running_total}");
+    }
+    println!("running total = {running_total}");
+}
+// 54916 too low