[文本处理] BAT怎么批量在每个段落的后面加个空行？

@echo off
(for /f "delims=" %%a in (a.txt) do (
  set "str=%%a"
  setlocal enabledelayedexpansion
  for %%b in (。 ！) do  if "!str:~-1!"=="%%b" set Flag=1
  if defined Flag (echo,!str!&echo,) else echo,!str!
  endlocal
))>b.txt
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