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'
Replace May with April
Determine Whether an array is empty
07 - Common functions and indexing 4
Find my birthday
Sum of diagonals elements of a matrix
Best Fit RMS
Find offset of an element of a multi dimensional matrix
Matrix to column conversion
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