Welcome to SO. Please note that this is not a free code writing service. Make a genuine attempt yourself and ask a specific question regarding your code. You might want to read Open letter to students with homework problems. — JASLP doesn't support the IES 29 secs ago

Please take a look here: Open letter to students with homework problems - Software Engineering Meta Stack Exchange — JJ Asghar 41 secs ago

@Tengiz Stack Overflow gets several thousand questions a day, I don't think we're in any danger of running out of questions. There are sites where questions regarding software patterns are more welcome (Software Engineering comes to mind, although one should always check the help center before asking questions, rather than asking a question and deleting later). — Heretic Monkey 32 secs ago

Do you really want someone else to do the homework for you? If you want help with your homework, please edit your question to show what you've come up with so far, and explain why it isn't working the way you expected it to. See also How do I ask and answer homework questions? and Open letter to students with homework problems — Klaus Gütter 22 secs ago

Unfortunately, your question doesn’t have enough information to provide a good answer as it was mentioned by previous comments. Please check How to create a Minimal, Reproducible Example or you can post your question in Software Engineering as your question as it is now, would be off topic for not being related to code, but infrastructure. — Alex 41 secs ago

I found it in a game-programmers book long ago... try "collision detection" — Jack Punt 31 secs ago