Per comments on the question, you are asking about a style recommendation from your IDE, related specifically to:

    if (myRoot == null) return myRoot;

Your IDE means that when that particular return statement is executed, myRoot is always null. It is obvious that this is so, because the if ensures that otherwise, that return is not executed. Your IDE is recommending that you change that to

    if (myRoot == null) return null;

Whether you do so is up to you, but personally, I would go with your IDE’s advice, because it makes the code slightly clearer.

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