private static @Nullable String nullIfEmpty(final @NonNull String string) {
        if (string.isEmpty()) {
            return null;
        }
        return string;
    }
Utility that extract {@link ArgumentDescriptor arguments} from
{@link java.lang.reflect.Method method} {@link java.lang.reflect.Parameter parameters}
cloud-annotations/src/main/java/org/incendo/cloud/annotations/extractor/StandardArgumentExtractor.java