my description is exactly what I did.
I only changed three files

1. in the exceptions file (nmap3/exceptions.py), I made the exception more clear
2. in the nmap3/utils.py file, I implemented nmap path checking in the get_nmap_path function. It is at this level that it is more convenient to do it.
3. in nmap3/nmap3.py I imported the check function and I had to fix all the methods that need this check. I got rid of their repetitive validation logic

I hope I was able to clearly explain what changes I made in the files and why.
If something has left unclear, I could answer your questions and help you figure it out

oh, sorry
I accidentally clicked something. I don't understand how it works.