Thanks for the reply. Here are the answers to your questions: Version 14.1 (14B47b) Mac OS Monterey (12.6.1) iMac 27" late 2015 with 32GB ram with 2T drive and there is 1.2T available space Command Line (hopefully this correct) 23 files I'm reading text files and creating nested structure with linked-list. I use malloc. (I hope this is sufficient) The maximum number of lines of code is 200 in some files No - I don't use external libraries. I do create header files and implementation files.