The last abstracted token is not replaced with concrete token

[mutrepair]

Hello! I hope you are doing well. I wanted to bring to your attention an issue I encountered while using CoCoNut. Specifically, I noticed that the last abstracted token in the patch is not being replaced with concrete tokens. I also took the liberty of proposing a solution to fix this issue, which you can find at this link: #15.

If you have a moment, would you be able to review this proposal and let me know your thoughts? I really appreciate your time and help with this. Thank you so much!