docs: public static void toHalfWidthDir(String path,String suffix) throws IOException {
  
  
  		List<File> files = MyFiles.getAllFiles(path, suffix);
  
  		for(File file:files){
  			BufferedReader in = new BufferedReader(new InputStreamReader(
  					new FileInputStream(file), "utf8"));
  			StringBuilder sb = new StringBuilder();
  			String line = null;
  			while ((line = in.readLine()) != null) {
  				line = line.trim();	
  				if(line.length()==0)
  					continue;
  				line = toHalfWidth(line);
  				sb.append(line);
  				sb.append("\n");
  			}
  			in.close();
  			BufferedWriter out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(
  					file), "utf8"));
  			out.write(sb.toString());
  			out.close();
  		}
  	}