Hi, welcome to iPF!
Here's a website link that could help removing as well as avoiding duplicate contacts: iCloud: Resolving duplicate Contacts after setting up iCloud Contacts[/url]
I hope that one/some of the steps explained here will fit your needs.
Thanks for effort. That did not help much. I have one question : How can I erase all contacts at one click so I can import fresh from a file for example access data file and delete it . Thanks.