Sync contacts from multiple sources

sunily

Disciple
I configured multiple email ID in my phone and contacts are saved randomly, some are on phone as well.

I need to format my cell and don't want to lose any contact. So I want all of my contacts present at single email ID or in phone.

Is there any app to sync all of them and remove duplicates? I checked play store there are many, but just want to check if anyone used such app before I format my cell.

I have Asus Zenfone Z010D, Android 6.0.1
 
Thanks Faraz, but before that I need all of the contacts at single place. That is what I am looking for.
All contacts from 3 gmail account sync at single place either phone or any 1 ID.
 
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