mukesh completed challenge 2,I'm trying challenge 5 now..But not able to clear the challenege 5..could you help me?

warehousecalloutservice:
public with sharing class WarehouseCalloutService implements Queueable, Database.AllowsCallouts {  
   private static final String WAREHOUSE_URL = 'https://th-superbadge-apex.herokuapp.com/equipment';    
   public static void runWarehouseEquipmentSync(){
       Http http = new Http();
       HttpRequest request = new HttpRequest();
       request.setMethod('GET');
       request.setEndpoint(WAREHOUSE_URL);
       HttpResponse response = http.send(request);
       if(response.getStatusCode() == 200) {
           List<Object> jsonResponse = (List<Object>)JSON.deserializeUntyped(response.getBody());
           system.debug('~~ '+jsonResponse);
           List<Product2> productList = new List<Product2>();
           for(Object ob : jsonResponse) {
               Map<String,Object> mapJson = (Map<String,Object>)ob;
               Product2 pr = new Product2();
               pr.Replacement_Part__c = (Boolean)mapJson.get('replacement');
               pr.Name = (String)mapJson.get('name');
               pr.Maintenance_Cycle__c = (Integer)mapJson.get('maintenanceperiod');
               pr.Lifespan_Months__c = (Integer)mapJson.get('lifespan');
               pr.Cost__c = (Decimal) mapJson.get('lifespan');
               pr.Warehouse_SKU__c = (String)mapJson.get('sku');
               pr.Current_Inventory__c = (Double) mapJson.get('quantity');
               productList.add(pr);
           }            
           if(productList.size()>0)
               upsert productList;
       }         
   }
   }    

warehousecalloutserviceMock:
@isTest
global class WarehouseCalloutServiceMock implements HttpCalloutMock {
    // implement http mock callout
    global static HttpResponse respond(HttpRequest request){
        System.assertEquals('https://th-superbadge-apex.herokuapp.com/equipment', request.getEndpoint());
 

        System.assertEquals('GET', request.getMethod());

        // Create a fake response
 

        HttpResponse response = new HttpResponse();
 

        response.setHeader('Content-Type', 'application/json');
 

        response.setBody('[{"_id":"55d66226726b611100aaf741","replacement":false,"quantity":5,"name":"Generator 1000 kW","maintenanceperiod":365,"lifespan":120,"cost":5000,"sku":"100003"}]'); 
        response.setStatusCode(200);
        return response;
 
    } 
}

warehousecalloutservicetest
@isTest 
private class WarehouseCalloutServiceTest {    
    @isTest   
  static void testWareHouseCallout(){
        Test.startTest(); 
        // implement mock callout test here
        Test.setMock(HTTPCalloutMock.class, new WarehouseCalloutServiceMock());
    WarehouseCalloutService.runWarehouseEquipmentSync();
        System.enqueueJob(new WarehouseCalloutService());
        Test.stopTest();
        System.assertEquals(1, [SELECT count() FROM Product2]);
    }     
}



error : Class WarehouseCalloutService must implement the method: void System.Queueable.execute(System.QueueableContext)