Function split_host_port 

pub fn split_host_port(input: &str) -> (&str, &str)

Splits the host part and the port part from an hostname

• “127.0.0.1” -> (“127.0.0.1”, “”)
• “127.0.0.1:80” -> (“127.0.0.1”, “80”)
• “[::1]” -> (“::1”, “”)
• “[::1]:8080” -> (“::1”, “8080”)
• “localhost:8080” -> (“localhost”, “8080”)