Colors and finish
NoOpEmailSender: selected automatically when email is disabled.
，详情可参考新收录的资料
By providing an opaque hint and not providing the word list, Strands creates a brain-teasing game that takes a little longer to play than its other games, like Wordle and Connections.。业内人士推荐新收录的资料作为进阶阅读
pub fn factorial(n: int) - int {
Provide the Server Name for ad-hoc servers.