Netherlands IBAN parsing rules

Examples

    iex>  %IbanEx.Iban{
    ...>    country_code: "NL",
    ...>    check_digits: "91",
    ...>    bank_code: "ABNA",
    ...>    branch_code: nil,
    ...>    national_check: nil,
    ...>    account_number: "0417164300"
    ...>  }
    ...>  |> IbanEx.Country.NL.to_string()
    "NL 91 ABNA 0417164300"