text: //
  //  HTTPService.h
  //  Tutorial
  //
  //  Created by Burak Firik on 1/4/18.
  //  Copyright © 2018 Burak Firik. All rights reserved.
  //
  
  #import <Foundation/Foundation.h>
  
  typedef void (^onComplete)(NSArray* __nullable dataDict, NSString* __nullable errMessage);
  
  @interface HTTPService : NSObject
  
  + (id) instance;
  -(void) getTutorials:(nullable onComplete) completionHandler;
  @end
  