What is the problem with this cpp code?

#include "robot_management/laser_turtle.h"
#include "ros/duration.h"
#include "ros/init.h"
#include "sensor_msgs/LaserScan.h"
#include <ros/ros.h>
#include <stdlib.h>

#include <list>
#include <string>

// TurtleClass constructor, make changes in the constructor as per definition
TurtleClass::TurtleClass() {
  n = ros::NodeHandle("~");

  this->last_laser_ranges = std::make_unique<float[]>(720);

  ROS_INFO("Initializing node.");
  usleep(2000000);
}

/* CREATE THE CLASS DESTRUCTOR HERE */
TurtleClass::~TurtleClass() {

}

int main(int argc, char **argv) {
  ros::init(argc, argv, "rosbot_class_node");

  TurtleClass tc = TurtleClass();

  ros::Duration(1).sleep();
  ros::spinOnce();

  ros::spin();

  return 0;
} The words with all capital letters should appear at least 4 times.
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