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This is my take on the task in this code review. My review is here

Problem

We have a robot that can pickup blocks from a stash, move them horizontally and lower them in place. There are 10 positions available to lower blocks number 0 to 9. Each position can hold up to 15 blocks.

The robot understands the commands 'P', 'M' and 'L':

• P: Pickup from the stash and move to position 0
• M: Move to the Next Position
• L: Lower the block

The robot is safe to operate and very forgiving:

• There are always blocks in the stash (Pickup always gets a block)
• If the robot already holds a block, Pickup will reset position to 0
• The robot will not go beyond position 9, Trying to move further does nothing
• Lowering the block on a pile of 15 does nothing
• Lowering without a block does nothing
• Robot ignores any command that is not 'P', 'M','L'

Implement a function that takes a String of commands for the robot. The function should output String representing the number of blocks (in hexadecimal) at each position after running all the commands