chore(04/2025): init day

Author: manhunto

readme.md

@@ -9,11 +9,12 @@
 
 # 2025
 
-| Day                                                       | Solved | Part 1 time (ms) | Part 2 time (ms) |
-|-----------------------------------------------------------|:------:|-----------------:|-----------------:|
-| [Day 1: Secret Entrance](src/solutions/year2025/day01.rs) |   ⭐    |            0.144 |                - |
-| [Day 2: Gift Shop](src/solutions/year2025/day02.rs)       |   ⭐⭐   |           65.103 |           81.719 |
-| [Day 3: Lobby](src/solutions/year2025/day03.rs)           |   ⭐⭐   |            0.131 |            0.133 |
+| Day                                                           | Solved | Part 1 time (ms) | Part 2 time (ms) |
+|---------------------------------------------------------------|:------:|-----------------:|-----------------:|
+| [Day 1: Secret Entrance](src/solutions/year2025/day01.rs)     |   ⭐    |            0.144 |                - |
+| [Day 2: Gift Shop](src/solutions/year2025/day02.rs)           |   ⭐⭐   |           65.103 |           81.719 |
+| [Day 3: Lobby](src/solutions/year2025/day03.rs)               |   ⭐⭐   |            0.131 |            0.133 |
+| [Day 4: Printing Department](src/solutions/year2025/day04.rs) |   -    |                - |                - |
 
 # 2024
 

src/solutions/mod.rs

@@ -18,6 +18,7 @@ pub fn solution(puzzle_day: PuzzleDay) -> Box<dyn Solution> {
             1 => Box::new(year2025::day01::Day01),
             2 => Box::new(year2025::day02::Day02),
             3 => Box::new(year2025::day03::Day03),
+            4 => Box::new(year2025::day04::Day04),
             _ => panic!("Day not exist"),
         },
         Year::Year2024 => match i {

src/solutions/year2025/day03.rs

@@ -74,7 +74,10 @@ impl Day03 {
             let search_slice = &numbers[start_index..=end_index];
 
             let max_digit = *search_slice.iter().max().unwrap();
-            let max_digit_offset = search_slice.iter().position(|&digit| digit == max_digit).unwrap();
+            let max_digit_offset = search_slice
+                .iter()
+                .position(|&digit| digit == max_digit)
+                .unwrap();
 
             result_digits.push(max_digit);
             start_index += max_digit_offset + 1;

src/solutions/year2025/day04.rs

@@ -0,0 +1,26 @@
+use crate::solutions::Solution;
+
+pub struct Day04;
+
+impl Solution for Day04 {
+    fn part_one(&self, _input: &str) -> String {
+        String::from("0")
+    }
+
+    fn part_two(&self, _input: &str) -> String {
+        String::from("0")
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::solutions::year2025::day04::Day04;
+    use crate::solutions::Solution;
+
+    const EXAMPLE: &str = r#""#;
+
+    #[test]
+    fn part_one_example_test() {
+        assert_eq!("0", Day04.part_one(EXAMPLE));
+    }
+}

src/solutions/year2025/mod.rs

@@ -1,3 +1,4 @@
 pub mod day01;
 pub mod day02;
 pub mod day03;
+pub mod day04;