In the _battle function the battlesWon in RapperStats struct is never updated.
If battlesWon is never used or updated it is better to be removed from the struct as it costs unnecessary gas. Or it should be implemented in the _battle function and in the calculation of the strength of the Rapper.
Low as battlesWon is not used anywhere.
Manual review
After a battle increment the battlesWon variable for the winner.
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