for /f "Tokens=*" %f in ('dir /l/b/a-d') do (rename "%f" "%f")
for /f "Tokens=*" %g in ('dir /b') do (for /f "Tokens=*" %f in ('dir %~fg /l /b /a-d') do (rename "%~fg\%f" "%f"))
for /f "Tokens=*" %f in ('dir /l/b/a-d') do (rename "%f" "%f")
for /f "Tokens=*" %g in ('dir /b') do (for /f "Tokens=*" %f in ('dir %~fg /l /b /a-d') do (rename "%~fg\%f" "%f"))