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//! Helpers to convert and add digits from characters.
// Convert u8 to digit.
#[inline]
pub(crate) fn to_digit(c: u8) -> Option<u32> {
(c as char).to_digit(10)
}
// Add digit to mantissa.
#[inline]
pub(crate) fn add_digit(value: u64, digit: u32) -> Option<u64> {
match value.checked_mul(10) {
None => None,
Some(n) => n.checked_add(digit as u64),
}
}