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I’m sorry but we can help with homework.
My suggestion is to keep re-writing and moving your code around. Check documentation, etc.
Also, with automated testing systems, you must make sure that you follow the specifications given in the instructions EXACTLY. If the instructions expect a specific output to be produced, then make sure that your code gives the exact same output as specified in the instructions including punctuation, wording, spacing etc. Automated systems are not human. They are checking your answer for an exact match against an expected output.