Fix taint analysis select hook with example

#### 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.