pub fn is_armstrong_number(num: u32) -> bool {
    let Some(count) = num.checked_ilog10().map(|count| count + 1) else {
        return true;
    };
    let armstrong_sum = (0..count).map(|i| {
        let divisor = 10u32.pow(i);
        let quotient = num / divisor;
        let digit = quotient % 10;
        let raised = digit.pow(count);
        raised
    }).sum();
    num == armstrong_sum
}