Additional test cases have been added.
Given a matrix, swap the 2nd & 3rd columns
Count letters occurence in text, specific to words with a given length.
Set the array elements whose value is 13 to 0
Convert a structure into a string
Cody Computer Part 3 - Detect the graphic card used on Cody Computer
Cody Computer Part 1 - Guess the system font used by uipanel
Cody Computer Part 5 - Guess the Name of Cody Computer
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