docs: public static void toHalfWidthFile(String infile, String outfile) throws IOException {
  		BufferedReader in = new BufferedReader(new InputStreamReader(
  				new FileInputStream(infile), "utf8"));
  		BufferedWriter out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(
  				outfile), "utf8"));
  
  		String line = null;
  		while ((line = in.readLine()) != null) {
  			line = line.trim();	
  			if(line.length()==0)
  				continue;
  			line = toHalfWidth(line);
  			out.write(line);
  			out.newLine();
  		}
  		in.close();
  		out.close();
  
  	}