Refactor: Merge add-memory logic for #32 and remove _create_memory

[ynamkit13]

This PR refactors the memory management logic in memory.py by merging the functionality of _create_memory directly into _simple_add for cleaner, more maintainable code.
Closes #32.

Solution Description
Combined the logic of _create_memory into a single _simple_add function.
Removed the now-redundant _create_memory method.
Updated internal calls and maintained all original functionalities.
Verified all tests pass (make test): no errors, regressions, or failures.
Improved code readability and maintainability by consolidating memory creation workflow.

[CLAassistant]

All committers have signed the CLA.

[ynamkit13]

Refactored memory logic by merging _create_memory into _simple_add, eliminating redundant code and simplifying function calls.
All original functionality is preserved; the code is now easier to maintain and extend.
Successfully removed unused/duplicate methods.
All tests pass after changes (make test), confirming the refactor did not introduce regressions.
Code formatting and linting were run according to project guidelines.
Documentation/comments are clear for future maintainers.

[Teingi]

Great work, we will review it as soon as possible.