What happens to Purgatory at the end of the world?

If you die in the state of grace; confessed your sins and received absolution, you still have to pay restitution for past sins don’t you? If you die at the end of the world and there is the last judgement, what then of pergatory and the soles there and the last on earth?
My understanding is that sins are forgiven through confession and the penance given at the time but isn’t there reparation to be paid either now on earth through sacrifice or good works or later in pergatory. Or id it possible as another has told me once a sin is forgiven it is gone for ever? Then what is the parade of sins and the division to the right and the left? Is the pergatory at the end of the world for those soles who need to make reparation?

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Recommended Reading:

[LIST]
*] Purgatory
*] The Roots of Purgatory
*]Do Catholics still believe in purgatory?
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