First Unique Character in a String (https://leetcode.com/problems/first-unique-character-in-a-string/description/)

accepted.go

package main

import (
	"fmt"
)

func main() {
	s := "leetcode"
	fmt.Println(firstUniqChar(s))
}

func firstUniqChar(s string) int {
	runes := []rune(s)
	check := map[rune]int{}
	for _, rune := range runes {
		check[rune]++
	}
	for i, rune := range runes {
		if check[rune] == 1 {
			return i
		}
	}
	return -1
}