diff --git a/exercises/07_structs/structs3.rs b/exercises/07_structs/structs3.rs
index d42729e..98733c7 100644
--- a/exercises/07_structs/structs3.rs
+++ b/exercises/07_structs/structs3.rs
@@ -10,19 +10,18 @@ struct Fireworks {
     rockets: usize,
 }
 
-// TODO: Turn this function into an associated function on `Fireworks`.
-fn new_fireworks() -> Fireworks {
-    Fireworks { rockets: 0 }
-}
+impl Fireworks {
+    fn new() -> Self {
+        Self { rockets: 0 }
+    }
 
-// TODO: Turn this function into a method on `Fireworks`.
-fn add_rockets(fireworks: &mut Fireworks, rockets: usize) {
-    fireworks.rockets += rockets
-}
+    fn add_rockets(&mut self, rockets: usize) {
+        self.rockets += rockets
+    }
 
-// TODO: Turn this function into a method on `Fireworks`.
-fn start(fireworks: Fireworks) -> String {
-    "🚀".repeat(fireworks.rockets)
+    fn start(self) -> String {
+        "🚀".repeat(self.rockets)
+    }
 }
 
 fn main() {