Mine

const char *
ewl_image_thumbnail_thumb_file_get(Ewl_Image_Thumbnail *thumb)
{
        const char *thumb_file;

        DENTER_FUNCTION(DLEVEL_STABLE);
        DCHECK_PARAM_PTR_RET("thumb", thumb, NULL);
        DCHECK_TYPE_RET("thumb", thumb, EWL_IMAGE_THUMBNAIL_TYPE, NULL);

        thumb_file = NULL;
        if (thumb->thumb)
        {
#ifdef BUILD_EPSILON_SUPPORT
                printf("welcome\n");
                thumb_file = epsilon_thumb_file_get(thumb->thumb);
#endif
        }
        if (thumb_file) printf("%s\n", thumb_file);
        DRETURN_PTR(thumb_file, DLEVEL_STABLE);
}