Decagon Software Engineer Tech Phone Screen: Cooking App Cart

First part of the question same as https://www.1point3acres.com/interview/thread/1180593

Part 2 was different:
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Part 2: Begin/Commit/Abort
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Add support for begin, commit and abort cart operations.

• begin(): Starts an operation of adding or removing things t
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  y remove the changes that were made during that begin (so in this case it would only commit/abort B).
  """
  
  Idea is to treat it like how a database would handle CRUD operations.