private void copyExtendedData(Map<String, Object> map, VCard card) {
    getString("manager", map).ifPresent(v -> card.setExtendedProperty("X-Manager", v));
    getString("spouseName", map).ifPresent(v -> card.setExtendedProperty("X-Spouse", v));
  }
Transforms from a Microsoft Graph contacts resource to a VCard as defined by
https://developer.microsoft.com/en-us/graph/docs/api-reference/v1.0/resources/contact.

<p>TODO: Handle contact lists (folders)
extensions/data-transfer/portability-data-transfer-microsoft/src/main/java/org/datatransferproject/transfer/microsoft/transformer/contacts/ToVCardTransformer.java