Use correct status codes

[AnshulMalik]

You can refer https://httpstatuses.com/, to know which status code to return.

• this should be 401
• this I don't know why this extra condition?
• this and this should return status 409(Conflict) instead of 200

There are many other cases, please resolve them as well

[AnshulMalik]

https://github.com/phoenixking25/Obscura-4.5-backend/blob/master/routes.py#L25 Should return empty array

https://github.com/phoenixking25/Obscura-4.5-backend/blob/master/routes.py#L47 Missing status code

https://github.com/phoenixking25/Obscura-4.5-backend/blob/master/routes.py#L132 Wrong answer isn't technically a bad request