func UnsafeStringToSlice2(s string) []byte {
	return *(*[]byte)(unsafe.Pointer(
		&struct {
			string
			int
		}{s, len(s)},
	))
}

package service

import (
	"reflect"
	"testing"
	"unsafe"
)

func BenchmarkToSlice(b *testing.B) {
	a := "hello world"
	var bs []byte
	b.Run("UnsafeStringToSlice", func(b *testing.B) {
		for i := 0; i < b.N; i++ {
			bs = UnsafeStringToSlice(a)
		}
	})
	b.Run("UnsafeStringToSlice2", func(b *testing.B) {
		for i := 0; i < b.N; i++ {
			bs = UnsafeStringToSlice2(a)
		}
	})

	_ = bs
}



func UnsafeStringToSlice(s string) (b []byte) {
	p := unsafe.Pointer((*reflect.StringHeader)(unsafe.Pointer(&s)).Data)
	hdr := (*reflect.SliceHeader)(unsafe.Pointer(&b))
	hdr.Data = uintptr(p)
	hdr.Cap = len(s)
	hdr.Len = len(s)
	return b
}

func UnsafeStringToSlice2(s string) []byte {
	return *(*[]byte)(unsafe.Pointer(
		&struct {
			string
			int
		}{s, len(s)},
	))
}