br-code 0.1.7

This is an code
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use rand::{rng, Rng};

/// 生成uuid
pub fn uuid() -> String {
    uuid::Uuid::new_v4().to_string()
}

/// 生成验证码
pub fn verification_code(len: usize) -> String {
    let text = "0123456789";
    let mut code = "".to_string();
    for _ in 0..len {
        let index = random_number(0, text.len() - 1);
        let t = &text[index..=index];
        code = format!("{}{}", code, t);
    }
    code.to_string()
}

/// 从一组字母+数字的字符，创建随机密码
pub fn random_password(len: usize) -> String {
    let text = "abcdefghijklmnopqrstuvwxyz0123456789";
    let mut code = "".to_string();
    for _ in 0..len {
        let index = random_number(0, text.len() - 1);
        let t = &text[index..=index];
        code = format!("{}{}", code, t);
    }
    code.to_string()
}

/// 生成指定范围内的随机数
pub fn random_number(begin: usize, finish: usize) -> usize {
    let mut rng = rng();
    rng.random_range(begin..=finish) as usize
}

pub fn random_number_f64(begin: f64, finish: f64) -> f64 {
    let mut rng = rng();
    rng.random_range(begin..=finish) as f64
}

#[cfg(test)]
mod tests {
    use crate::random::{random_number, random_number_f64, random_password, uuid, verification_code};

    #[test]
    fn random() {
        let res = uuid();
        println!("uuid: {}", res);

        let res = verification_code(4);
        println!("verification_code: {}", res);

        let res = random_password(4);
        println!("verification_code: {}", res);

        let res = random_number(1,50);
        println!("verification_code: {}", res);

        let res = random_number_f64(0.1,10.9);
        println!("verification_code: {}", res);
    }
}