pub fn parse_size(size_str: &str) -> Option<u64> {
    let mut num = String::new();
    let mut unit = String::new();

    for c in size_str.chars() {
        if c.is_digit(10) || c == '.' {
            num.push(c);
        } else {
            unit.push(c);
        }
    }

    let num: f64 = num.parse().ok()?;
    let multiplier = match unit.to_lowercase().as_str() {
        "g" | "gb" => 1024 * 1024 * 1024,
        "m" | "mb" => 1024 * 1024,
        "k" | "kb" => 1024,
        _ => panic!("Invalid Size"),
    };

    Some((num * multiplier as f64) as u64)
}