Aoc 2023 day 1 part 1 finished, warming my fingers

advent_of_code/2023/1/Cargo.toml

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

advent_of_code/2023/1/src/main.rs

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+fn solve_1(input: &str) -> u32 {
+    input
+        .lines()
+        .map(|l| {
+            // Digits are 0-9, so we know that if they
+            // are still 10 they haven't been changed
+            let mut first = 10;
+            let mut last = 10;
+
+            for c in l.chars() {
+                if let Some(digit) = c.to_digit(10) {
+                    if first == 10 {
+                        first = digit;
+                    }
+                    last = digit;
+                }
+            }
+
+            first * 10 + last
+        })
+        .sum()
+}
+
+fn main() {
+    println!("Hello, this is Patrick!");
+
+    let input_txt = include_str!("../input.txt");
+
+    let result_1 = solve_1(input_txt);
+
+    println!("The sum of all calibration values is {}", result_1);
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_1() {
+        let test_input = include_str!("../test.txt");
+
+        assert_eq!(solve_1(test_input), 142);
+    }
+}

advent_of_code/2023/1/test.txt

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+1abc2
+pqr3stu8vwx
+a1b2c3d4e5f
+treb7uchet