Compute the Checksum Seed

Basic

A simple checksum routine starts by summing the decimal digits of an account number. Build that digit-sum step.

Implement `solve(Integer n)` (non-negative) to return the sum of its decimal digits.

Examples

Inputn = 1234

Output10

Inputn = 0

Output0

Hints

Repeatedly take Math.mod(n, 10) and divide n by 10.

Anonymous Apex

Integer solve(Integer n) {
    // return the sum of n’s digits
    return null;
}

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