Fix taint analysis select hook with example

[AntDum]

Description

Fixed the select hook, which previously popped 3 values but failed to push any value, resulting in incorrect analysis. This update corrects the behavior of the select hook to ensure it pushes the expected value. Additionally, I have added a new example to demonstrate the corrected behavior.

Changes Made

• Corrected the select hook to push the appropriate value after popping 3 values.
• Added a new example showcasing the corrected behavior of the select hook.