Photo Illustration by Luis G. Rendon/The Daily Beast/Facebook/LightyearA former Goldman Sachs investment banker who went to prison in 2018 for stalking his ex and beating her new beau with a hammer claims his then-business partner stole their tech company out from under him while he was behind bars.But the other man, Dennis Thankachan, a serial entrepreneur backed by Mark Cuban, argues that he’s the one who was wronged by the “lovestruck loon” and his computer-savvy mom, who allegedly hacked int