Access the Internet host database to get information about the machine whose name is denoted by the string
The host-information record that is returned will contain the official name of the machine, a list of aliases
(alternative names), and a non-empty list of IP addresses for this machine. On success, return a host-information
record. An exception is raised when
n does not appear in the database.
let hi = host_info("google.com") host_info_name(hi) // google.com host_info_aliases(hi) //  host_info_addresses(hi) // [#u8[172, 217, 26, 206]]
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