curl --request POST \
  --url http://localhost:8080/cabinet/contests/{round_id}/answer \
  --header 'Content-Type: application/json' \
  --data '
{
  "round_id": 123,
  "answer": "<string>"
}
'

{
  "is_winner": true,
  "message": "<string>",
  "prize_type": "<string>",
  "prize_value": "<string>"
}