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find-the-nth-digit-of-a-number.swift

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func findDigit(_ num: Int, _ nth: Int) -> Int {

let positive = abs(num)

guard nth > 0 else { return -1 }

guard positive > 0 else { return 0 }

guard nth > 1 else { return positive % 10 }

return findDigit(positive / 10, nth - 1)

}