Format y2015d15 and add check to prevent overriding days...

y2015/src/bin/d15.rs

@@ -16,5 +16,6 @@ fn part1() {
 fn part2() {
     let root = env!("CARGO_MANIFEST_DIR");
     let content = fs::read_to_string(format!("{root}/resources/15_input.txt")).unwrap();
-    println!("{}", d15::process_part2(&content));
+    // change comments in part1
+    //println!("{}", d15::process_part2(&content));
 }

y2015/src/bin/d18.rs

@@ -0,0 +1,20 @@
+use std::fs;
+
+use y2015::days::d18;
+
+fn main() {
+    part1();
+    part2();
+}
+
+fn part1() {
+    let root = env!("CARGO_MANIFEST_DIR");
+    let content = fs::read_to_string(format!("{root}/resources/18_input.txt")).unwrap();
+    println!("{}", d18::process_part1(&content));
+}
+
+fn part2() {
+    let root = env!("CARGO_MANIFEST_DIR");
+    let content = fs::read_to_string(format!("{root}/resources/18_input.txt")).unwrap();
+    println!("{}", d18::process_part2(&content));
+}

y2015/src/days/d15.rs

@@ -185,10 +185,4 @@ Cinnamon: capacity 2, durability 3, flavor -2, texture -1, calories 3";
         let result = process_part1(INPUT);
         assert_eq!(result, 62842880);
     }
-
-    #[test]
-    fn part2() {
-        let result = process_part2(INPUT);
-        assert_eq!(result, 0);
-    }
 }

y2015/src/days/d18.rs

@@ -0,0 +1,26 @@
+pub fn process_part1(input: &str) -> i32 {
+    0
+}
+
+pub fn process_part2(input: &str) -> i32 {
+    0
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    const INPUT: &str = "{{EXAMPLE}}";
+
+    #[test]
+    fn part1() {
+        let result = process_part1(INPUT);
+        assert_eq!(result, 0);
+    }
+
+    #[test]
+    fn part2() {
+        let result = process_part2(INPUT);
+        assert_eq!(result, 0);
+    }
+}

y2015/src/days/mod.rs

@@ -17,3 +17,9 @@ pub mod d9;
 pub mod d16;
 
 pub mod d17;
+
+pub mod d18;
+
+pub mod d18;
+
+pub mod d18;