went

@echo off & cd /d "%~dp0"
set "f1=a.txt"
set "f2=b.txt"
(
	for /f "usebackq delims=" %%i in ("%f1%") do (
		set /p "s="
		call echo %%i%%s%%
	)
)<"%f2%">"%f1%_new"
move /y "%f1%_new" "%f1%"
pause&exit
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