public static void splitCustom(String str) {
        char[] arrStr = str.toCharArray();
        List<String> arrStrings = new ArrayList<>();
        String partOfSplit = "";

        for (int i = 0; i < arrStr.length; i++) {

            String ch = Character.toString(arrStr[i]);
            if (ch.equals(" ")) {

                if(partOfSplit.length()>0){
                    arrStrings.add(partOfSplit);
                }

                partOfSplit = "";

            } else {
                partOfSplit += ch;
            }
        }

        if(partOfSplit.length()>0){
            arrStrings.add(partOfSplit);
        }

        System.out.println(arrStrings);
    }