Function FormatOneDigit

cpp/src/arrow/util/formatting.h:146–149

template <typename Int>
void FormatOneDigit(Int value, char** cursor) {
  assert(value >= 0 && value <= 9);
  FormatOneChar(static_cast<char>('0' + value), cursor);
}

// GH-35662: I don't know why but the following combination causes SEGV:
// * template implementation without inline