fix: make comments clear and detailed

src/main/java/org/model/Car.java

@@ -25,6 +25,7 @@ public abstract class Car extends Vehicle implements Serviceable {
     // TODO: Override getEnergyType() → return "Unknown"
 
     // TODO: Override showDetails()
+    // Print brand, model, year, mileage, and number of seats
 
     /*
      * Implement Serviceable methods:

src/main/java/org/model/ElectricCar.java

@@ -30,6 +30,8 @@ public class ElectricCar extends Car implements Chargeable {
     // TODO: Override getEnergyType() → return "Electric"
 
     // TODO: Override showDetails()
+    // Call super.showDetails()
+    // Print battery capacity and charge level
 
     // TODO: Implement charge(double amount)
     // Validate negative

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

@@ -34,4 +34,6 @@ public class GasCar extends Car implements Refuelable {
     // Cap at 100
 
     // TODO: Override showDetails()
+    // Call super.showDetails()
+    // Print fuel level and fuel type
 }

src/main/java/org/model/SportsCar.java

@@ -25,7 +25,6 @@ public class SportsCar extends GasCar {
     }
 
     // TODO: Override showDetails()
-    // Print header
     // Call super.showDetails()
     // Print acceleration time
 }