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'
Determine whether a vector is monotonically increasing
Project Euler: Problem 10, Sum of Primes
Whether the input is vector?
Create a matrix with difference of each row of input matrix
Create a v-notch vector without "sort" function
Tax Season ! How much is my salary?
Let's get back to school: create mixed numbered fraction
Matrix rotation as per given angle
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