Add solutions for "Day 5: Cafeteria", part 1 and 2

src/main.rs

@@ -1,9 +1,9 @@
+mod cafeteria;
+mod interval;
 mod printing_department;
 
-use printing_department::PrintingDepartment;
-
 fn main() {
-    println!("### Advent of Code 2025 ###");
-    let mut solver = PrintingDepartment::new();
-    solver.run();
+    println!("### Advent of Code 2025 ###\n");
+    printing_department::PrintingDepartment::new().run();
+    cafeteria::Cafeteria::new().run();
 }