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'
Number of Circles in a Number
Convert a vector into a number
Magic is simple (for beginners)
Given an input string, generate a variable name out of it
Return the names and values of the input arguments of a function
Create a v-notch vector without "sort" function
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