Reverse

 public static String mainReverseMethod(String strForManipulation) {


        StringBuilder string = new StringBuilder();
        String check = "";
        String[] splitString = strForManipulation.split(SEPARATOR);
        for (String word : splitString) {
            char[] everySymbol = word.toCharArray();
            reverse(everySymbol);
            string.append(SEPARATOR);
            check = string.append(everySymbol).toString();
        }
        return check;
    }

    private static String reverse(char[]everySymbol) {
        StringBuilder stringBuilder = new StringBuilder();

        int leftCounter = 0;
        int rightCounter = everySymbol.length - 1;



        while (leftCounter < rightCounter) {
            if (!Character.isLetter(everySymbol[leftCounter]))
                leftCounter++;
            else if (!Character.isLetter(everySymbol[rightCounter]))
                rightCounter--;

            else {
                char tmp = everySymbol[leftCounter];
                everySymbol[leftCounter] = everySymbol[rightCounter];
                everySymbol[rightCounter] = tmp;
                leftCounter++;
                rightCounter--;
            }

        }

        return stringBuilder.append(everySymbol).toString() ;
    }