Fix : Removed Overwritten refund Method Definition

[akashagg30]

Fixes #289

This pull request removes the first refund method definition from the class, as it was being overwritten by the second definition. Since Python does not support function overloading, the first method was redundant and unused.

Changes Made:

• Removed the refund method with the amount parameter.

Reason for Change:
The first definition was being overwritten, causing the logic for handling refunds with the amount parameter to be lost. Removing the redundant definition simplifies the code and eliminates potential confusion.

Impact:
This change ensures that the remaining refund method is the sole implementation, avoiding ambiguity in the codebase.