“Contractor did not done the work” doesn’t make sense as a phrase. You could say The contractor has not done the work.
1. “The contractor did not do the work” and 2. “contractor did not done the work” It is assumed in sentence 1. the work has not been done by saying “do”. This is sufficient enough for the sentence and done is not needed.
Overall both sentences are very similar and make the same point if you use the corrected sentence above. However the “done” is not needed to get the point across of the sentence!
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