How to write the name of the text file into the text file using bat?

Question

I have a problem. I have many text file (.txt). I want to write the name of the corresponding text files inside them and finally merge them. I have lots of them. I cant do it manually, its too time consuming.

Suppose, i have a text file named "windows.txt" and its contents are

Windows XP
Windows 7
Windows 8

I want their contents to be

windows
Windows XP
Windows 7
Windows 8

After merging similar files they should look like

windows
Windows XP
Windows 7
Windows 8

continents
Europe
Asia
Africa

languages
English
Chinese

Please HELP !!

Answer 1

@echo off
echo. >result
for /f %%i in ('dir /b /a-d *.txt') do (
 echo.
 echo %%~ni
 type %%i
)>>result
ren result result.txt

Pseude-Code for better understanding:

turn echo off
delete result file
for all txt files in current directory do:
 print empty line
 print name of textfile without extension
 print textfile
and put it into new file "result"
if done, rename the resulting file