pub fn dump_u32_vec(file_name: &str, data: Vec<u32>) -> Result<(), String> {
    use std::fs::File;
    use std::io::Write;
    if let Ok(mut file) = File::create(file_name) {
        for value in data {
            if let Err(error) = file.write_all(&value.to_le_bytes()) {
                return Err(error.to_string());
            }
        }
    } else {
        return Err(String::from("Error creating file"));
    }
    Ok(())
}