expando_callback_no_color

static void simple_s(void *data, MuttFormatFlags flags, struct Buffer *buf)
{
  const struct SimpleExpandoData *sd = data;

  const char *s = NONULL(sd->s);
  buf_strcpy(buf, s);
}

static void simple_C(void *data, MuttFormatFlags flags, struct Buffer *buf)
{
  const struct SimpleExpandoData *sd = data;

  const int num = sd->C;
  buf_printf(buf, "%d", num);
}