int firstUniqChar(char * s){
    int i=0;
    int len = strlen(s);
    int tmp[26];
    memset(tmp,0,sizeof(tmp));
    for(int i=0;i<len;i++)
    {
        tmp[s[i]-'a']++;
    }
    for(i=0;i<len;i++)
    {
        if(tmp[s[i]-'a'] == 1)
        {
            return i;
        }
    }
    
    return -1;
}