Additional test cases have been added.
Make a checkerboard matrix
Back to basics 3 - Temp Directory
Back to basics 22 - Rotate a matrix
Getting the absolute index from a matrix
The sum of the numbers in the vector
Cody Computer Part 5 - Guess the Name of Cody Computer
Convert a numerical matrix into a cell array of strings
Set the array elements whose value is 13 to 0
Angle between two vectors
Generate a string like abbcccddddeeeee
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