How to search and replace a string in multiple html files within a directory and it's sub-directories with Windows CMD?

Question

This is requirement is similar to How to search and replace a string in multiple text files (within a directory) with Windows CMD? Part 2

I want to perform Find and Replace on all HTML files inside a folder and it's sub-folders.

Here I am taking 2 inputs from 1 of which is file path & another is folder name in that file path for some reason.

set /p INPUT1= Enter Source file path:
set /p INPUT2= Enter Source folder name (**Without any Space**): 

Here let's assume (below folders can change):
INPUT1= D:\!Test\
INPUT2= Folder1

Then path is D:\!Test\Folder1\
Inside Folder1 there are some more folders like:
....Folder1\A\Common\
....Folder1\B\Common\
....Folder1\C\Common\

In above folder **A** as well as folder **Common** have html files.

I have coded this in .cmd file as below:

set /p INPUT1= Enter Source file path: 
set /p INPUT2= Enter Source folder name (**Without any Space**): 

REM Replace text FindTextX.html with ReplaceTextA.html in folder A, ReplaceTextB.html in folder B, ReplaceTextC.html in folder C.
Set "OldStringA=FindTextX.html" Set "NewStringA=ReplaceTextA.html" Set "NewStringB=ReplaceTextB.html" Set "NewStringC=ReplaceTextC.html"

@ECHO OFF &SETLOCAL
cd %INPUT1%\%INPUT2%\A\
for %%x in (*.html) do call:process "%%~x"
goto:eof
:process 
set "outFile=%~n1%~x1"  
(for /f "skip=2 delims=" %%a in ('find /n /v "" "%~1"') do (  
    set "ln=%%a"  
    Setlocal enableDelayedExpansion  
    set "ln=!ln:*]=!"  
    if defined ln (
        set "ln=!ln:%OldStringA%=%NewStringA%!"
    )
    echo(!ln!  
    endlocal  
))>"%outFile%"
REM exit /b
REM Come out of A folder
cd..
REM Go inside of B folder
cd B
for %%x in (*.html) do call:process1 "%%~x"
goto:eof
:process1
set "outFile=%~n1%~x1"  
(for /f "skip=2 delims=" %%a in ('find /n /v "" "%~1"') do (  
    set "ln=%%a"  
    Setlocal enableDelayedExpansion  
    set "ln=!ln:*]=!"  
    if defined ln (
        set "ln=!ln:%OldStringB%=%NewStringB%!"  
    )
    echo(!ln!  
    endlocal  
))>"%outFile%"
.......So on for folder **C** .....
exit /b

However this does not work. I get empty html file inside folder A, B & C. However it does not work on Sub-folder Common which is inside each A, B and C folders. I want this script to replace text in HTML files under folder A, B and C as well as text inside their sub-folders. Note: I do not want any additional BAT files like FART, REPLACER, .... etc. Your help is appreciated.