fix some warning

src/utils/error.rs

@@ -1,7 +1,5 @@
 use std::{convert::From, net::AddrParseError, string::ParseError};
 
-use aes::cipher::typenum::IsLessOrEqual;
-
 pub type Result<T> = std::result::Result<T, SDLanError>;
 
 #[derive(Debug)]

src/utils/myrsa.rs

@@ -8,7 +8,6 @@ use rsa::{Pkcs1v15Encrypt, RsaPrivateKey, RsaPublicKey};
 
 use std::fs::File;
 use std::io::Read;
-use std::path::Path;
 
 pub fn gen_rsa_keys(mut dirpath: &str) {
     if dirpath.len() == 0 {