func cname(s string) string {
	if t, ok := nameToC[s]; ok {
		return t
	}

	if t, ok := strings.CutPrefix(s, "struct_"); ok {
		return "struct " + t
	}
	if t, ok := strings.CutPrefix(s, "union_"); ok {
		return "union " + t
	}
	if t, ok := strings.CutPrefix(s, "enum_"); ok {
		return "enum " + t
	}
	if t, ok := strings.CutPrefix(s, "sizeof_"); ok {
		return "sizeof(" + cname(t) + ")"
	}
	return s
}

	{"", "d", "", false},
	{"", "", "", true},
}

func TestCutPrefix(t *testing.T) {
	for _, tt := range cutPrefixTests {
		if after, found := CutPrefix([]byte(tt.s), []byte(tt.sep)); string(after) != tt.after || found != tt.found {
			t.Errorf("CutPrefix(%q, %q) = %q, %v, want %q, %v", tt.s, tt.sep, after, found, tt.after, tt.found)
		}
	}
}

var cutSuffixTests = []struct {
	s, sep string