The returns a normalized {@code ZoneId} that can be used in place of this ID.The result will have {@code ZoneRules} equivalent to those returned by this object,however the ID returned by {@code getId()} may be different.
The normalization checks if the rules of this {@code ZoneId} have a fixed offset.If they do, then the {@code ZoneOffset} equal to that offset is returned.Otherwise {@code this} is returned. @return the time-zone unique ID, not null
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