Completed Design-2 problems

[varnika-98]

No description provided.

[super30admin]

Strengths:

• The solution correctly implements the queue using two stacks, demonstrating a good understanding of the problem.
• The code is clean, well-organized, and follows best practices.
• The use of a helper method (_shift) to handle the transfer of elements between stacks is a good design choice.

Areas for Improvement:

• While the solution is correct, it would be beneficial to add comments explaining the purpose of each method and the overall approach, especially for someone who might be new to this concept.
• The _shift method could be made private (by prefixing it with a double underscore __shift) to indicate that it is an internal helper method and not meant to be called directly by users of the class.