Lucky and Digit

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Bunny and Lucky are good friends. One day Bunny decided to play a game with Lucky. So he gave two numbers (a and b) and ask her to find the multiplication of a and b. She is good at mathematics, so she multiplied them and gave the answer within seconds. So he decided to add some more spicy to the problem. So he asked her to add all digits in the result until the resultant will be a single digit. L

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solution.cppC++17

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