text: //
  //  NSString+AIFormatter.h
  //  AIBehavioursExample
  //
  //  Created by Alex Bakhtin on 4/7/16.
  //  Copyright © 2016 Alex Bakhtin. All rights reserved.
  //
  
  #import <Foundation/Foundation.h>
  
  @interface NSString (AIFormatter)
  - (void)ai_enumerateCharactersUsingBlock:(void (^)(NSString * character, NSUInteger idx, bool *stop))block;
  - (NSString *)ai_characterAtIndex:(NSUInteger)index;
  @end
  