Lambda requirements

All lambdas should implement the same algorithm in different programming languages:

1. Parse iteration parameter
2. Respond with 400 BAD REQUEST if the params wasn't provieded
3. Save all params to dynamodb alongside with the programming language and AWS Lambda event

langCase	iteration	... all other parameters as separate columns ...	raw_event
ruby-2.7-x86	1	...	...

4. Try to read item with iteration = <current iteration from params> - 1 and langCase = <your language>
5. Respond with previous item (if it is missing, respond with the newly inserted item)

Let the battle begin!