Updating data from multiple .txt files into one .txt file without erasing the previous data

[onevideo123]

I have multiple files .txt in a different directory. Every of these files contains multiple lines of code. I would use FFS to automatically copy the data from these files into one .txt file. All these files must have the same name. Every time that this happens, the data that already are inside the .txt shouldn't be erased.
For example, i have \A\banana.txt that contain 01000101 - \B\banana.txt that contains 01101001 - and \C\banana.txt that contain 11110010. I would that 01000101 from \A\banana.txt and 01101001 from \B\banana.txt were copied inside \C\banana.txt and I'm expecting as final result \C\banana.txt containing 01000101 01101001 11110010. Is there a way to configure ffs to do this without writing any script? If not, please let me know how to do, I'm quite new in scripting. Thanks for your help and sharing your knowledge

[Gianni1962]

IMHO, FFS is not the tool for this job.

[onevideo123]

IMHO, FFS is not the tool for this job.

Any suggestion? Or should I do it from the scratch?