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'
Extract leading non-zero digit
surface of a spherical planet
convert matrix to single column
Create a two dimensional zero matrix
Let's get back to school: create mixed numbered fraction
Sum of diagonals elements of a matrix
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