Faroe Islands IBAN parsing rules

Examples

    iex>  %IbanEx.Iban{
    ...>    country_code: "FO",
    ...>    check_digits: "62",
    ...>    bank_code: "6460",
    ...>    branch_code: nil,
    ...>    national_check: "4",
    ...>    account_number: "000163163"
    ...>  }
    ...>  |> IbanEx.Country.FO.to_string()
    "FO 62 6460 000163163 4"