Remove hardcoded API key

[Vikranth3140]

The OpenAI API key is currently hardcoded in the code, which is insecure. Replace it with environment variable handling to protect sensitive data.

[CocoNautty]

I notice your code is using openai==0.28, in which the methods are significantly different from that of 1.0.0. I wonder if you gonna stick to 0.28 or reconstruct the code.

[Vikranth3140]

I notice your code is using openai==0.28, in which the methods are significantly different from that of 1.0.0. I wonder if you gonna stick to 0.28 or reconstruct the code.

Hi, I'm planning to change the methods and reconstruct the code, will make an issue for this.

Thanks for pointing out.