umya-spreadsheet 3.0.0

umya-spreadsheet is a library written in pure Rust to read and write xlsx file.
Documentation 
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pub(crate) fn format_as_fraction(value: f64, format: &str) -> String {
    let sign = if value < 0f64 { "-" } else { "" };

    let integer_part = value.abs().floor();
    let decimal_part = (value.abs() % 1f64)
        .to_string()
        .replace("0.", "")
        .parse::<f64>()
        .unwrap();
    let decimal_length = decimal_part.to_string().len();
    let decimal_divisor = 10f64.powi(num_traits::cast(decimal_length).unwrap());

    let gcd = gcd(decimal_part, decimal_divisor);

    let mut adjusted_decimal_part = decimal_part / gcd;
    let adjusted_decimal_divisor = decimal_divisor / gcd;

    let result: String;
    if format.contains('0') {
        return format!("{sign}{integer_part} {adjusted_decimal_part}/{adjusted_decimal_divisor}");
    }

    if format.contains('#') {
        if integer_part == 0f64 {
            result = format!("{sign}{adjusted_decimal_part}/{adjusted_decimal_divisor}");
        } else {
            result =
                format!("{sign}{integer_part} {adjusted_decimal_part}/{adjusted_decimal_divisor}");
        }
        return result;
    }

    let check_format: String = format.chars().take(3).collect();
    if check_format == "? ?" {
        let mut integer_part_str = integer_part.to_string();
        if integer_part == 0f64 {
            integer_part_str = String::new();
        }
        result =
            format!("{sign}{integer_part_str} {adjusted_decimal_part}/{adjusted_decimal_divisor}");
    } else {
        adjusted_decimal_part += integer_part * adjusted_decimal_divisor;
        result = format!("{sign}{adjusted_decimal_part}/{adjusted_decimal_divisor}");
    }

    result
}

#[inline]
fn gcd(a: f64, b: f64) -> f64 {
    if b == 0f64 { a } else { gcd(b, a % b) }
}