fix: Enhance PR #787

[Wendong-Fan]

Description

PR #787 need to be further polished

some commit comment:

https://github.com/camel-ai/camel/commit/4f289158e3dbb5673c0368555997fd6d255e16b9#comments

Motivation and Context

• [ ] I have raised an issue to propose this change (required for new features and bug fixes)

Types of changes

What types of changes does your code introduce? Put an x in all the boxes that apply:

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds core functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Documentation (update in the documentation)
• [ ] Example (update in the folder of example)

Implemented Tasks

• [ ] Subtask 1
• [ ] Subtask 2
• [ ] Subtask 3

Checklist

Go over all the following points, and put an x in all the boxes that apply. If you are unsure about any of these, don't hesitate to ask. We are here to help!

• [ ] I have read the CONTRIBUTION guide. (required)
• [ ] My change requires a change to the documentation.
• [ ] I have updated the tests accordingly. (required for a bug fix or a new feature)
• [ ] I have updated the documentation accordingly.