Batch-Hybrid Special Character Fault?

As long as I know, some special characters can be displayed if you echo them using "". I'm simply stuck on the code, trying to figure out where I can change for this to work. I can't see the problem. Code from [here][1].
What i need is a special code that can do write animations for me, and then exit. Just like that. I've copied the code from [there][1], modified so it could be called using `typewriter.bat "text" "charsnum-1"`, like `typewriter "Hello" 4`. Though I don't *really* understand Batch Hybrids, and, even knowing how to interpret code, I can't see where the symbols are getting stuck at.

To reproduce my problem: `typewriter.bat "Hello?" 5`

Code:

@if (@CodeSection == @Batch) @then

@echo off
setlocal

color 70
set charnuu=%2

call :split chars %1

:begin
for %%i in (%chars%) do call :type "%%~i"
exit /b
goto begin

:split <var_to_set> <str>
setlocal enabledelayedexpansion
set "line="
set "str=%~2"
for /L %%I in (0,1,%charnuu%) do set line=!line! "!str:~%%I,1!"
endlocal & set "%~1=%line%"
goto :EOF

:type <char>
cscript /nologo /e:JScript "%~f0" "%~1"
goto :EOF

@end
// end batch / begin JScript chimera
function pause() { WSH.Sleep(Math.random() * 50 + 50); }
function odds(num) { return !(Math.round(Math.random() * num) % num) }


pause();

if (odds(300)) WSH.Echo('');
if (!odds(400)) WSH.StdOut.Write(WSH.Arguments(0));

This code isn't showing common symbols or even the basic ones, like `?`. Maybe I am too tired to see it. Help me.


[1]:

[To see links please register here]

Question marks can't be processed by regular `for` loops, but you can get around that by not processing the individual letters with a loop at all and just iterating over the entire string as a whole:

@echo off

REM Just kinda honor-system the string length since this is proof of concept
REM but remember that string indices start at 0
set "string=%~1"
set "string_length=%~2"

REM Generate a backspace character for later
for /f %%A in ('"prompt $H&for %%B in (1) do rem"') do set "BS=%%A"

REM The setlocal is down here instead of at the top like it usually is to handle
REM strings that contain exclamation points.
REM There's a period followed by a backspace before the substring is printed in
REM case the current character happens to be a space (which otherwise
REM wouldn't get printed).
REM The timeout /t 0 is because timeout is an external command that technically
REM needs a few milliseconds to start up, so setting the wait period to 0
REM seconds actually generates a pause shorter than 1 second.
setlocal enabledelayedexpansion
for /L %%A in (0,1,%string_length%) do (
<nul set /p "=.%BS%!string:~%%A,1!"
>nul timeout /t 0
)