(possible_optimizations_and_improvement_of_complexities): shrinivas_kane

[shrinivaskane]

1. Optimized Bubble Sort Code
2. Added empty list and invalid index check for finding duplicates in an array
3. Added input validation for reverse inplace
4. Modified algorithm in Longest Dictionary word for keyword check to make it more reliable
5. Added meaningful function names and comments to look and tell
6. Removed unnecessary type conversion for numbers in English
7. Used Localized stack instead of global stack for balancing symbols
8. Edited comment to add meaningful info for balanced binary search tree
9. Removed unwanted code and empty queue check for Circular Queue
10. Used iterative solution to improve space complexity of the solution for Pallindrome
11. Used iterative solution to improve space complexity of the solution for multiplication