I apologize if something similar has been posted already. My boyfriend and I are first time homeowners and we bought a fixer-upper. We’ve been slowly working on the home ourselves. We tore up the carpet in the living room and there’s this giant gap that it looks like has been filled with a random piece of wood and then filled in with something that I can only relate to joint compound. How can I fix this? It looks awful! Sorry I don’t have a better photo.