Get files of any extention to a folder

Get files from folder containing many subfolders & files in each subfolder

This function helps you to extract files from subfolders.
I have main folder(feature) containing subfolders(subfeature)each subfeature has models & xl files.
While testing we need to take all the models & libraries to a single folder.
This code can be used & it is generalized to extract the files with the extension you specify.......
May be useful to you.......
I think I need to practice in giving comments ...
Updated with comments......
Your suggestions are welcome.......
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