text: //
  //  NSString+FFExtern.h
  //  FFDB
  //
  //  Created by Fidetro on 2018/9/24.
  //  Copyright © 2018年 Fidetro. All rights reserved.
  //
  
  #import <Foundation/Foundation.h>
  
  NS_ASSUME_NONNULL_BEGIN
  
  @interface NSString (FFExtern)
  
  @end
  
  NS_ASSUME_NONNULL_END
  