Hi,
Have a look at the FPGA Math & Analysis VIs and Functions. There are ready-made Butterworth and Notch filters.
By the way, if you want to post any code in the future, open your LabVIEW Block Diagram, select the code, and click "Edit" -> "Create VI Snippet from Selection". That produces a high-quality PNG file that other users can import directly into LabVIEW to test your code.