slice和string互转

// StringToBytes converts string to byte slice without a memory allocation.
func StringToBytes(s string) []byte {
	return *(*[]byte)(unsafe.Pointer(
		&struct {
			Data string
			Cap  int
		}{s, len(s)},
	))
}

// BytesToString converts byte slice to string without a memory allocation.
func BytesToString(b []byte) string {
	return *(*string)(unsafe.Pointer(&b))
}