Hey TeachMe
The best way to remove redundant contact files is to manage them from your gmail account. Access your Gmail account from computer system and and go to contacts. There you will see all your contact files (multiple copies). Select all the contacts and then click on more, click on merge contacts with same name. Duplicate entries will be removed.
Further go to settings of your android phone > Applications > manage applications > all > contacts storage and click on clear data (this will delete all contacts info from your mobile memory).
Now go to contacts > accounts > your Gmail account and sync Gmail contacts.
You will have your contacts back in your cell, with no redundant data.