Implement end protocol

[osvegn]

Describe the feature

• Implement the end protocol

Describe alternatives

Describe any alternative to the feature describe before here

Additionals

END
When the brain obtains this command, it must terminate as soon as possible. The manager waits until the brain is finished. If the time of termination is too long (e.g. 1 second), the brain will be terminated by the manager. The brain should not write anything to output after the END command. However, the manager should not close the pipe until the brain is ended.

Expected answer: none
The brain should delete its temporary files.