I apologize for the confusion, but I don't have any previous code to review or improve. The code section in your initial message was empty (null), and I haven't been provided with any actual code for the SkillSwap app.

Without having the original code to work with, I cannot make improvements or updates. If you have the actual code for the SkillSwap app, please provide it, and I'll be happy to review and improve it based on the specification and any suggestions.

Once I have the code, I can make the necessary changes and provide you with the updated version.