Strings : First Unique Character in a String

firstUniqChar.go

func firstUniqChar(s string) int {
    for i:= 0 ; i < len(s) ; i++ {
        ch := string(s[i])
        isUnique := true
        for j:= 0 ; j < len(s); j++ {
            if j != i && string(s[j]) == ch {
                isUnique = false
                break
            }         
        }
        
        if isUnique {
            return i 
        }
               
    }
    
    return -1
}