reverse.go

package main

import (
	"bufio"
	"fmt"
	"os"
	"strings"

	"github.com/rivo/uniseg"
)

func reverseStringSlice(ss []string) {
	last := len(ss) - 1
	for i := 0; i < len(ss)/2; i++ {
		ss[i], ss[last-i] = ss[last-i], ss[i]
	}
}

func unicodeReverse(in string) string {
	var chunks []string
	gr := uniseg.NewGraphemes(in)
	for gr.Next() {
		chunks = append(chunks, gr.Str())
	}
	reverseStringSlice(chunks)
	return strings.Join(chunks, "")
}

func main() {
	scanner := bufio.NewScanner(os.Stdin)
	for scanner.Scan() {
		fmt.Println(unicodeReverse(scanner.Text()))
	}
}