Complete Car project implementation.

src/main/java/org/model/GasCar.java

@@ -28,12 +28,37 @@ public class GasCar extends Car implements Refuelable {
     }
 
     // TODO: Override getEnergyType() → return fuelType + " (Gas)"
+    @Override
+    public String getEnergyType(){
+        return fuelType + " (Gas)";
+    }
+
 
     // TODO: Implement refuel(double amount)
     // Validate amount
     // Cap at 100
+    @Override
+    public void refuel(double amount){
+        if (amount < 0){
+            System.out.println("Error: Cannot refuel with negative amount.");
+            return;
+        }
+
+        fuelLevel += amount;
+
+        if (fuelLevel > 100){
+            fuelLevel = 100;
+        }
+
+        System.out.println("Refueled. Current fuel level: " + fuelLevel + "%");
+    }
 
     // TODO: Override showDetails()
     // Call super.showDetails()
     // Print fuel level and fuel type
+    @Override
+    public void showDetails(){
+        super.showDetails();
+        System.out.println("Fuel Type: " + fuelType + " | Fuel Level: " + fuelLevel + "%");
+    }
 }