Invoker (Carl) is a classic game character in Dota, and it is related to program interfaces at the same time. When I was young, I liked a very skilled pub - star player in Dota whose name was Ferrari_430. He had a well - known nickname, "Pianist Carl", which was really cool! So, a passionate young boy started using this name, longing to be as graceful and powerful as Invoker, and attempted to incorporate such grace and power into the code.
