TBH, your instructions are extremely ambiguous and - unless I'm missing something, your sample output is not achievable using any interpretation of the instructions I can think of. Step 3 is the main offender here.
Unless we are supposed to do 1 or 2 or 3 based upon the original number - in which case 3 is never going to happen. Overall, a pretty poorly worded challenge to give to beginners.
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Your transformed sequence is wrong according to the transformations, since it contains numbers greater than 10, which would be removed by step 3.
TBH, your instructions are extremely ambiguous and - unless I'm missing something, your sample output is not achievable using any interpretation of the instructions I can think of. Step 3 is the main offender here.
Unless we are supposed to do 1 or 2 or 3 based upon the original number - in which case 3 is never going to happen. Overall, a pretty poorly worded challenge to give to beginners.