* Create Sudoku_Solver
Each of the digits 1-9 must occur exactly once in each row.
Each of the digits 1-9 must occur exactly once in each column.
Each of the digits 1-9 must occur exactly once in each of the 9 3x3 sub-boxes of the grid.
The '.' character indicates empty cells.
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* Add doctests, exceptions, type hints and fix bug for infix_to_prefix_conversion.py
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* symmectric tree
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* fix the edge case of the double ended queue pop the last element
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* add median of two sorted array
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* infix to prefix missing feature added
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* infix to prefix missing feature added
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* newly updated infix_to_prefix
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* from the beginning
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* flatten binary tree to linked list - 1
* flatten binary tree to linked list final
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* Made binary tree memory-friendly using generators based travels. Fixes
#8725
* Made binary tree memory-friendly using generators based travels. Fixes
#8725
* Fixed pre-commit errors
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* added addAtPosition to simple linked list
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Renamed neural_network/input_data.py to neural_network/input_data.py_tf
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* enhance the implementation of queue using list
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* Fix insertion fail in ["*X", "*XX"] cases
Consider a word, and a copy of that word, but with the last letter repeating twice. (e.g., ["ABC", "ABCC"])
When adding the second word's last letter, it only compares the previous word's prefix—the last letter of the word already in the Radix Tree: 'C'—and the letter to be added—the last letter of the word we're currently adding: 'C'. So it wrongly passes the "Case 1" check, marks the current node as a leaf node when it already was, then returns when there's still one more letter to add.
The issue arises because `prefix` includes the letter of the node itself. (e.g., `nodes: {'C' : RadixNode()}, is_leaf: True, prefix: 'C'`) It can be easily fixed by simply adding the `is_leaf` check, asking if there are more letters to be added.
- Test Case: `"A AA AAA AAAA"`
- Fixed correct output:
```
Words: ['A', 'AA', 'AAA', 'AAAA']
Tree:
- A (leaf)
-- A (leaf)
--- A (leaf)
---- A (leaf)
```
- Current incorrect output:
```
Words: ['A', 'AA', 'AAA', 'AAAA']
Tree:
- A (leaf)
-- AA (leaf)
--- A (leaf)
```
*N.B.* This passed test cases for [Croatian Open Competition in Informatics 2012/2013 Contest #3 Task 5 HERKABE](https://hsin.hr/coci/archive/2012_2013/)
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