code: func (f *PixbufFormat) GetExtensions() []string {
  	var extensions []string
  	c := C.gdk_pixbuf_format_get_extensions(f.native())
  	if c == nil {
  		return nil
  	}
  	for *c != nil {
  		extensions = append(extensions, C.GoString((*C.char)(*c)))
  		c = C.next_gcharptr(c)
  	}
  	return extensions
  }
docs: // GetExtensions is a wrapper around gdk_pixbuf_format_get_extensions().