I have a situation in which we use a system that the code is open source, but we have made some modifications to fit our need.
Now the original system has undergone code changes to improve security, I'm looking at their commits and implementing changes to our system.
There is some tool, maybe even in git itself, where I could make a comparison, which in case I took the code of the day I gave the fork in their code, my current code and their current code and make a comparison , sort of returning a union code from the changes of mine and theirs?