For a given input string str, find how many spaces are there in the string and replace those spaces with *
e.g. str = 'this is demo of replacing spaces with stars';
out = 'this*is*demo*of*replacing*spaces*with*stars'
Implement a ROT13 cipher
Check to see if a Sudoku Puzzle is Solved
Max index of 3D array
Is it a number?
Evaluating a polynomial
Let's get back to school, and create multiplication tables
Given an input string, generate a variable name out of it
Let's get back to school: create mixed numbered fraction
Who is the baby and who is the daddy in this family?
Sum of diagonals elements of a matrix
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