Reduce to Single Digit

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Given a number N, the task is to reduce it to a single-digit number by repeatedly subtracting the adjacent digits. That is, in the first iteration, subtract all of the adjacent digits to generate a new number, if this number contains more than one digit, repeat the same process until it becomes a single-digit number. Input: N = 6972 Output: 2 | 6 – 9 | = 3 | 9 – 7 | = 2 | 7 – 2 | = 5 After fir

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solution.cppC++17

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