C++ demo sourcecode representing design pattern usage needed ASAP

I'm in need of help of programmer who can provide me with a sample of C++ sourcecode that will: - be written in C++ language; - will have 3 different design patterns; - will have a possibility to show in main() function how do these design patterns work in 'real life'. I do understand this sounds like a academic assignment, but it's not. I need this by 17th of January, so I'm in a hurry. I guess some programmers might have different sourcecodes/implementations in their repositories, so it might not be a case of providing me with the sourcecode that you already have - just tiny bit of modifications. But, if you think you would have to write it from a scratch just provide me with details and your offer. I'm opened to negotations. I need this sourcecode to present in main() function the use of design patterns, so please do not try to sell me ready sourcecode derived from tutorials ;) Best regards, Stefan