// Use CowStr ?
pubfnemail_url(s:&str)-> String{if s.starts_with("mailto:"){
s.into()}elseif s.starts_with("https:")|| s.starts_with("http:"){// XX warn!("using a non-email URL where an email address was expected: {s:?}");
s.into()}else{// hope all is well !
format!("mailto:{s}")}}