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    Talking for Python version.

    Their could be REAL test cases . Those provided are :

    • not working out of the box (test.expect_equal does not exist,test.expect do)
    • provide no edge case at all (words with length == width, multiple spaces between words, ...)

    Since you have to use the submit button to actually test your solution, some message could be more explicite and include line.
    Example :"Line starts or ends with a space" Which line ? How was it formated ?