master.country_name mapping to redo

I have just extracted the count of how many contracts there are per country, but some countries are named differently, so there are double results. Can we change the mapping?

Equatorial Guinea and Guineas

Tanzania, united republic of and Tanzania, United Republic of

Congo, the democratic republic of the and Congo, the Democratic Republic of the

Thanks

Also can we change Lybian etc. to Lybia?
