How to save modification of a file in original file not a new one?

[mjrezayani]

Dear all,

I have a code to modify a file. This code make changes on my file and save it to a new file. But, I want to have changes(modifications) on my original file not a new one. I made attempts to change the code but it didn't work. How can I modify my code to save modification on my original file? My code is attached here.

Thanks alot