Czech Republic IBAN parsing rules

Examples

    iex>  %IbanEx.Iban{
    ...>    country_code: "CZ",
    ...>    check_digits: "65",
    ...>    bank_code: "0800",
    ...>    branch_code: nil,
    ...>    national_check: nil,
    ...>    account_number: "0000192000145399"
    ...>  }
    ...>  |> IbanEx.Country.CZ.to_string()
    "CZ 65 0800 0000192000145399"