async fn read_from_file_or_stin<Type: FHIRJSONDeserializer>(
file_path: &Option<String>,
) -> Result<Type, OperationOutcomeError>async fn read_from_file_or_stin<Type: FHIRJSONDeserializer>(
file_path: &Option<String>,
) -> Result<Type, OperationOutcomeError>