Hungary IBAN parsing rules

Examples

    iex>  %IbanEx.Iban{
    ...>    country_code: "HU",
    ...>    check_digits: "42",
    ...>    bank_code: "117",
    ...>    branch_code: "7301",
    ...>    national_check: "0",
    ...>    account_number: "6111110180000000"
    ...>  }
    ...>  |> IbanEx.Country.HU.to_string()
    "HU 42 117 7301 6111110180000000 0"