Synopsis:
   $uhc(<broken nick!user@host>)

Technical:
   This function finishes a partially-complete nick!user@host.

Practical:
   It can be used to make a matching nick!user@host in an alias that doesn't
   know what part of the nick!user@host was written.

Returns:
   completed nick!user@host

Examples:
   $uhc(nick)                       returns "nick!*@*"
   $uhc(user@host.com)              returns "*!user@host.com"
   $uhc(*.host.com)                 returns "*!*@*.host.com"

See Also:
   deuhc(6); match(6); userhost(6)