I had some problems with cut. I could not convince it to use multiple spaces as a single delimiter. So I had to expand the line a bit but it seems to work now:
It is tested and it works (yes, I had to trigger the issue again to test it but that part was easy).

What it does:

• ps aux lists the running processes;
• The first grep filters out only those processes with "whogo" anywhere in the command line that started it - be it in the name or arguments;
• The second grep eliminates the grep process itself from the results;
• The third grep is only useful if you use the attached script - it eliminates the grep script itself from the results;
• sed merges multiple spaces into a single space;
• cut splits each line of output into fields, using a space as a delimiter and letting only the second field (the one containing the process ID, or PID) through;
• xargs collects the output (which by now is a few lines, each containing just the PID of a WhoGo process) into an argument list for the kill command.

I am attaching the line as a script. Copy it into /home/nemo, remove the .txt extension (I had to add it to pacify the TMO uploader) and run from the command line like this:
Or add the execute permission and run it like this: