Check for duplicates before saving them on database

@sabrinaamazon
As already mentioned, my provided code was not completely debuged.

The rest you will have to improve by your own…

Take a look onto console and try to inspect your own code.

Follow the logical console-infos…

Add your own console-logs, to inspect and understand your own code even better.

If you still are not able to solve it → than feel free to ask for a second helping hand. But first try to do it by your own. Learning by doing is the best method to learn something.