package main

import "fmt"

func countChars(s string) map[rune]int {
	counts := make(map[rune]int)
	for _, c := range s {
		counts[c]++
	}
	return counts
}

func main() {
	str := "Hello, 世界! 👋"
	fmt.Printf("%q\n", countChars(str))
	fmt.Println("--------------------------------")
	for k, v := range countChars(str) {
		fmt.Printf("%q 出现了 %d 次\n", k, v)
	}
}