Divide method

 public static void divideData(List<String> data, int index, int partitions) {

        if (partitions == 0 || index >= data.size()) {
            return;
        }

        if (partitions < 0 || partitions > 100) {
            return;
        }

        int dataLen = data.get(index).length();
        int partitionLen =  dataLen / partitions;
        List<String> divElements = new ArrayList<>();
        int nextPartitionIdx = 0;
        if (partitionLen == 0) {
            return;
        }


        int remainder = dataLen % partitions;
        if (remainder == 0) {
            for (int i = 0; i < partitions; i++) {

                divElements.add(data.get(index).substring(nextPartitionIdx,nextPartitionIdx+partitionLen));
                nextPartitionIdx+=partitionLen;
            }


        } else {
            for (int i = 0; i < partitions; i++) {

                if (i == partitions - 1) {

                    partitionLen+= remainder;
                }
                divElements.add(data.get(index).substring(nextPartitionIdx,nextPartitionIdx+partitionLen));
                nextPartitionIdx+=partitionLen;
            }
        }

            data.remove(index);
            data.addAll(index, divElements);
    }