/// generates a random string based on a coinflip.
generates a random string based on a coinflip.
generates a random string based on a coinflip .
pub fn passphrase() -> Option<String> {
    if coinflip() {
        Some(string(4096))
    } else {
        None
    }
}
pub fn passphrase ( ) -> Option < String > { if coinflip ( ) { Some ( string ( 4096 ) ) } else { None } }
generates a random string based on a coinflip.
generates a random string based on a coinflip .