Looking for friends

Just wondering if there is a malawian community in Berlin

You can find the Malawian (or any other nationality) forum members in Germany here:
https://www.expat.com/en/network/europe/germany/
There aren't many. You can also ask at the embassy.
And also consider that when "looking for friends" in Germany, you should not rule out the Germans and any other nationality to increase your chances.