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'
Remove all the consonants
Alphabetize by last name
radius of a spherical planet
pressure to dB?
Divide by 4
Create a matrix with difference of each row of input matrix
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Sum of diagonals elements of a matrix
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