charHolder = string1.toLowerCase().toCharArray();
    //TODO: print first non-repeated character
    for(int outerLoop = 0; outerLoop < charHolder.length - 1  ; ++outerLoop){
        int FLAG = 0; // TODO: to check if number repeted or not
        if(charHolder[outerLoop] == ' ' ) continue;
        for(int innerLoop = outerLoop + 1; innerLoop <= charHolder.length - 1;++innerLoop){
            if(innerLoop == charHolder.length && FLAG == 0) {
                return charHolder[outerLoop];
            }
            if(charHolder[innerLoop] == ' ') continue;
            if(charHolder[innerLoop] == charHolder[outerLoop]){
                FLAG = 1;
                charHolder[innerLoop] = ' ';
            }
        }
    }
    return ' ';
}