/*Write a program to simulate the operation of a simple robot. The robot moves in four directions: Forward, backward, right, and left. * The job of the robot is to move items and place it in the right slots in each station. The robot arm goes up and down to place items * in the designated area. There is eight stations plus the pick up station. Pick up station is the initial start where the robot picks * the items. 8 items can be placed on each station. The nearest station must be filled before placing items on the next stations. The * items are marked with identification or serial numbers. The items with even serial number go to the left and items with odd number * to the right. The last slot, number 7 reserved for light items that are less than 60kg. The serial number is a five-digit number, * the MSB digit 5 indicates that the product must be placed in the fifth station, which is keeping the product at 21-degree F. By * receiving the message of unload, the machine should start emptying the fifth station and place the items in the refrigeration * container until it is empty. There two other stations marked as 10 and 11 which each consists of 4 slots. The station 10 designated * for items that are for immediate delivery and station 11 is for items that require 5 days' storage in that shelf before that can be * released. Another station is marked as Station 9 used for special delivery. The slots higher than 6 requires the robot to raise up * to place the item. The company place a new station to hold defective items. Items are checked for damages before placing it. * */