Fix bugs and run Android Random voice calling app with firebase and agora within 1 day

its 5 screens android java app. Random voice 1 to 1 calling with firebase and agora. App is already built by someone. but it does not work at all. find and fix bugs and run it requirements : 1. User select his own gender at sign up 2. User must select his interest partner before starting call 3. random Query function using loop. user interest partner should match with available user gender interest on database 4. if call end by one user or dropped then by loop automatically will search for next available user with same condition 5. user when start app, it will show database online. so, online, his own gender and interest partner these 3 condition will match with available user on database. 6. one call only 2 users as its 1 ton 1 call. 7. each call duration must be saved to user total call duration need delivery by today. its simple calling. bid the amount you want to work. I don't want negotiation. thanks