[Starter] Find 5 bugs in this Python code and explain fixes

STARTER JOB! Find 5+ bugs in this code: def process_users(users): results=[]; for i in range(len(users)): user=users[i]; user['status']='adult' if user['age']>18 else 'minor'; user['valid_email']=user['email'].contains('@'); results.append(user); average=sum(u['age'] for u in results)/len(results); return {'users':results,'avg':average}. For each: describe bug, explain impact, show fix.