如何将十六进制字符串转换为Vec<u8>

fn hex_string_to_bytes(hex_string: &str) -> Vec<u8> {
    let mut bytes = Vec::new();
    let mut chars = hex_string.chars().peekable();

    while let Some(c1) = chars.next() {
        if let Some(c2) = chars.next() {
            let byte = match u8::from_str_radix(&format!("{}{}", c1, c2), 16) {
                Ok(byte) => byte,
                Err(_) => panic!("Invalid hex string"),
            };
            bytes.push(byte);
        } else {
            panic!("Invalid hex string");
        }
    }

    bytes
}