type_str_helper
n = type_str_helper(buf, size, type);
n = type_str_helper(buf, size, type);
n = type_str_helper(buf, size, return_type);
n += type_str_helper(buf + n, size - n, arg_type);
n += type_str_helper(buf + n, size - n, type);
type_str_helper(buf, sizeof(buf), type);