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    expected: <-14> but was: <14>
    

    The kata description says

    The sum of the even digits and the sum of the odd digits must be performed.

    Then the results of the sums will be subtracted ...

    What is being subtracted by what? Is it subtraction or difference, which will be the absolute value?

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    int is not a suitable return value type: result such as powerOfPrimes(777777777) easily surpasses the value of a int.