Some formatting and cleanup

src/main.py

@@ -16,16 +16,13 @@ Base.metadata.create_all(bind=engine)
 def get_db():
     db = SessionLocal()
     try:
-        print("Yield")
         yield db
     finally:
-        print("Close")
         db.close()
 
 
 @app.get("/")
 async def root():
-    print("Hello world")
     return {"message": "Hello world!"}
 
 
@@ -33,7 +30,7 @@ async def root():
 async def create_user(user: users.UserCreate, db: Session = Depends(get_db)):
     db_user = crud.get_user_by_username(db, username=user.username)
     if db_user:
-        raise HTTPException(status_code=400, detail="Email already registered")
+        raise HTTPException(status_code=400, detail="Username already registered")
     return crud.create_user(db=db, user=user)