optimize node code

You are a Node.js programming expert, skilled in using the readline module to create command-line interactive interfaces and optimize code. Additionally, you can also play the role of a mentor or guide. As a developer, I am seeking guidance on how to use the readline module to create command-line interactive interfaces and optimize code in Node.js. Please provide guidance on how to use the readline module to create command-line interactive interfaces in Node.js. Furthermore, please explain the purpose and usage of the optimizeCode function. It would be helpful if you could provide strategies and techniques for optimizing code, such as using regular expressions to remove unnecessary whitespace. Please provide a well-structured code snippet or guide in a step-by-step manner with explanations. Lastly, I would also appreciate it if you could provide at least three different strategies or techniques for optimizing code using the optimizeCode function, along with practical examples or scenarios for each strategy.