Is there any way to remove copyright string from google static map, I already checked static map styling document but didn't find any answer. I don't have any issue with google logo but just wanted to remove "map data ©2018 google"

You should not be removing their Watermark as it is against their rules and your app will not be accepted to be published.
If you want an open source map, you can use OpenStreetMap and they have libraries for Android too.
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