Rust Day 1 Part 1

rust/Cargo.lock

@@ -4,4 +4,4 @@ version = 3
 
 [[package]]
 name = "advent-of-code"
-version = "23.0.0"
+version = "23.1.1"

rust/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "advent-of-code"
-version = "23.0.0"
+version = "23.1.1"
 
 [profile.release]
 strip = "symbols"
@@ -22,3 +22,7 @@ name = "template"
 # day00 for alphabetic sorting
 path = "src/day00/main.rs"
 test = false
+
+[[bin]]
+name = "day01"
+path = "src/day01/main.rs"

rust/src/day01/main.rs

@@ -0,0 +1,11 @@
+const INPUT: &str = include_str!("input.txt");
+
+mod part_1;
+use part_1::part_1;
+mod part_2;
+use part_2::part_2;
+
+fn main() {
+    println!("{}", part_1(INPUT));
+    println!("{}", part_2(INPUT));
+}

rust/src/day01/part_1.rs

@@ -0,0 +1,29 @@
+pub(crate) fn part_1(input: &'static str) -> u64 {
+    input
+        .lines()
+        .map(|line| {
+            let mut digits = line.chars().filter(char::is_ascii_digit);
+            let first_digit = digits.next().expect("At least 1 digit should be present");
+            let last_digit = digits.last().unwrap_or(first_digit);
+
+            format!("{first_digit}{last_digit}")
+                .parse::<u64>()
+                .expect("Two digits should make a number")
+        })
+        .sum()
+}
+
+#[cfg(test)]
+mod tests {
+    const SAMPLE_INPUT: &str = include_str!("sample_input.txt");
+
+    #[test]
+    fn test_with_sample_solution() {
+        assert_eq!(super::part_1(SAMPLE_INPUT), 142)
+    }
+
+    #[test]
+    fn test_with_solution() {
+        assert_eq!(super::part_1(crate::INPUT), 55488);
+    }
+}

rust/src/day01/part_2.rs

@@ -0,0 +1,24 @@
+pub(crate) fn part_2(_input: &'static str) -> u64 {
+    todo!("Part 2")
+}
+
+#[cfg(test)]
+mod tests {
+    const SAMPLE_INPUT: &str = include_str!("sample_input.txt");
+
+    #[test]
+    fn test_with_sample_solution() {
+        assert_eq!(
+            super::part_2(SAMPLE_INPUT),
+            todo!("Add result from example part 2")
+        );
+    }
+
+    #[test]
+    fn test_with_solution() {
+        assert_eq!(
+            super::part_2(crate::INPUT),
+            todo!("Add result for solved part 2")
+        );
+    }
+}

rust/src/day01/sample_input.txt

@@ -0,0 +1,4 @@
+1bc2
+pqr3stu8vwx
+a1b2c3d4e5f
+treb7uchet