fix : add importations + fixing typos

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

@@ -27,7 +27,7 @@ public abstract class Car extends Vehicle implements Serviceable {
 
 
     @java.lang.Override
-    public string getEnergyType() {
+    public String getEnergyType() {
         return "Unknown";
     }
 
@@ -44,8 +44,8 @@ public abstract class Car extends Vehicle implements Serviceable {
 
 
     @java.lang.Override
-    public boolean needsService() {
-        if (getMileage() > 10000) {
+    public boolean needsService(Vehicle v) {
+        if (v.getMileage() > 10000) {
             return true;
         } else {
             return false;
@@ -54,7 +54,7 @@ public abstract class Car extends Vehicle implements Serviceable {
 
 //performanceService
 @java.lang.Override
-public void performaceService(){
+public void performService(){
         System.out.println("General car service completed");
 }
 }

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

@@ -58,7 +58,7 @@ public class ElectricCar extends Car implements Chargeable {
     }
 
     @java.lang.Override
-    public boolean needsService() {
+    public boolean needsService(Vehicle v) {
         if (getMileage() > 8000) {
             return true;
         } else {

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

@@ -30,7 +30,7 @@ public class GasCar extends Car implements Refuelable {
     // TODO: Override getEnergyType() → return fuelType + " (Gas)"
 
     @java.lang.Override
-    public string getEnergyType() {
+    public String getEnergyType() {
         return fuelType + " (Gas)";
     }
 
@@ -58,8 +58,8 @@ public class GasCar extends Car implements Refuelable {
     }
 
     @java.lang.Override
-    public boolean needsService() {
-        if (getMileage()>12000){
+    public boolean needsService(Vehicle v) {
+        if (v.getMileage()>12000){
             return true;
         }else {
             return false;
@@ -67,7 +67,7 @@ public class GasCar extends Car implements Refuelable {
     }
 
     @java.lang.Override
-    public void performaceService() {
+    public void performService() {
         System.out.println("Engine oil changed");
         fuelLevel=100;
     }

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

@@ -40,7 +40,7 @@ public class SportsCar extends GasCar {
     }
 
     @java.lang.Override
-    public string getEnergyType() {
+    public String getEnergyType() {
         return super.getEnergyType();
     }
 }

src/main/java/org/model/Vehicle.java

@@ -48,7 +48,7 @@ public abstract class Vehicle {
    }
 
     // TODO: Declare abstract method getEnergyType()
-    public abstract string getEnergyType();
+    public abstract String getEnergyType();
 
     public void basicInfo() {
         System.out.println(