gawk

@echo off
setlocal enabledelayedexpansion
(for /f "delims=" %%i in (a.txt) do (
    set /p str=
    echo ^<VirtualHost %%i^>
    echo DocumentRoot C:/xampp/htdocs/!str!
    echo ServerName %%i
    echo ^</VirtualHost^>
))<b.txt >c.txt
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