digit-sum-no-validation

Status: IN

`digitSum` performs no input validation; non-digit characters raise `ValueError` from `int(c)`, and `k=0` raises `ValueError` from `range(0, len(s), 0)`.

Source: entries/2026/06/06/calculate-digit-sum-of-a-string-solution.md

Depended on by

• digit-operations-handle-all-nonneg-inputs

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