1. YoShit is not a script,it's a full fledged trading platform containing multiple scripts and other software advancements.
2. Anybody selling you crap calling it a "script" should not be trusted as they might be scamming you.
3. If you're buying such crap,you won't be serious about your project and hence your exchange should not be trusted.
4. Developing a trading platform requires skilled set of developers who are experts at security and other stuff since people will be trusting them with their money.