# Functions
GetAccountRegisterDetails prompts user for registration data like name, email, organizatoin.
InterfaceWithPublicIP finds first interface with public ip.
IsDomainName checks if a string is a presentation-format domain name (currently restricted to hostname-compatible "preferred name" LDH labels and SRV-like "underscore labels"; see golang.org/issue/12421).
IsSpecialIP returns true if given ip belongs to network address from RFC 3330 and RFC 5166.
ShadowKey replaces middel of key with dots, so it could be safe printed to the console.
StringsContains checks if given val exists in s slice.
# Variables
Special-Use IPv4 Addresses RFC 3330 (https://tools.ietf.org/html/rfc3330).
Special-Use IPv6 Addresses RFC (https://tools.ietf.org/html/rfc5166).