/// Retrieves the key fingerprint, encoded in hex and separated in two character chunks/// with colons.pubfnformat_fingerprint(fingerprint:&str)->Result<String, thrussh_keys::Error>{let raw_hex =hex::encode(base64::decode(&fingerprint).map_err(|_|thrussh_keys::Error::CouldNotReadKey)?,);letmut hex =String::with_capacity(raw_hex.len()+(raw_hex.len()/2-1));for(i, c)in raw_hex.chars().enumerate(){if i !=0&& i %2==0{ hex.push(':');} hex.push(c);}Ok(hex)}