I literally copied and pasted a part of the test suite into my code to make it work.
This is not a good thing.
Back to basics 23 - Triangular matrix
Number of 1s in a binary string
Generate a string like abbcccddddeeeee
Find and replaces spaces from a input string with *
Find out total non zero element of matrix
Order of things - 3
Remove element(s) from cell array
Number of problems
Wayfinding 3 - passed areas
Wayfinding 4 - Crossing, level 2
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