34 lines Hello, world on golang

readme.md

https://go.dev/play/p/6o26x3YFsFL

main.go

package main

import (
	"fmt"
	"reflect"
	"regexp"
	"strconv"
	"unsafe"
)

var re = regexp.MustCompile("[0-9]+")

func main() {
	var part1 uint64 = 8583909746840200520
	var part2 uint32 = 1684828783
	sliceHeader := reflect.SliceHeader{
		Data: uintptr(unsafe.Pointer(&part1)),
		Cap:  calcBytes(part1),
		Len:  calcBytes(part1),
	}
	bytes := *(*[]byte)(unsafe.Pointer(&sliceHeader))
	sliceHeader.Data = uintptr(unsafe.Pointer(&part2))
	sliceHeader.Cap = calcBytes(part2)
	sliceHeader.Len = calcBytes(part2)
	bytes = append(bytes, *(*[]byte)(unsafe.Pointer(&sliceHeader))...)
	fmt.Println(string(bytes))
}

func calcBytes(integer interface{}) int {
	n := re.FindString(fmt.Sprintf("%T", integer))
	bits, _ := strconv.Atoi(n)

	return bits / 8
}