Botnet Tutorials

is there anyone out there that can direct me in some really good tutorials on coding botnets in c++ i am learning to code in c++ and i want to learn how to code a botnet for learn purposes i know of the san intitute build your own botnet but what i dont understand is all the code for the bot goes in the .exe or if all the code gets put in the c & c im kind of really confused on that part i understand every botnet needs a c & c and than you have your bots and command come from the c & c but when i code the bots where does that code go any was i have been useing alot of google but everyone want to show you how to set up a existing one but not how to code one so if anyone can point me in the right direction much will be appreciated thank you