I really don't see the point of that kind of problems where you can't use Matlab built-in functions.
Test for balanced parentheses
Back to basics 4 - Search Path
Angle between Two Vectors
Determine the number of odd integers in a vector
Convert a structure into a string
Cody Computer Part 2 - Get the license number of Cody Computer
Multiply 2 numbers
Join Strings with Multiple Different Delimiters
Assign numerical values to a structure with 1 field
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