[User Security Summit 2023] Classify the risk sample 5

[jiachengxu]

Try to identify the risk type in the following sample file and add it to the repo by making a pull request:
https://github.com/cryptousersecurity/events/blob/main/workshops/2023-user-security-summit-trc-workshop/samples/05.sol
Contribution Guideline: https://github.com/cryptousersecurity/token-risk-classification/blob/main/CONTRIBUTING.md#contribute-new-risk-samples