The method call `trace?.item()` has been replaced with `trace?.fence()`. This could potentially change the behavior of the program if the `fence` method does not perform the same operation as the `item` method. Please ensure that this change is intentional and that the `fence` method is suitable for this context. 🧐

The conversion of CSV data to markdown has been significantly altered. The new implementation manually constructs the markdown string, which could potentially introduce errors if not done correctly. It's important to thoroughly test this new implementation to ensure it correctly converts all possible CSV inputs to the expected markdown format. 🧐