who corrected the idea of the alchemist?

Question

about the alchemist

Answer 1

No one

Conspiracy theorists will always be with us.
If anyone tries to persuade them that something does not work, the conspiracy theorist thinks that person is part of the cover0up.

Answer 2

This childish fashion of skipping all Capitals, along with your poor English, and the placement of your question here and under Mythology & Folklore, makes it difficult to tell whether you mean:

Who corrected the errors of alchemy?
which might belong under
Science & Mathematics > Chemistry
or better,
Arts & Humanities > History
(My answer: Other scientists, building on the knowledge of the alchemists.)

OR
In the novel "The Alchemist" by Paulo Coelho, who corrected the ideas of the title character?
which should be in
Arts & Humanities > Books & Authors
or, given the application of Coelho's work, in
Society & Culture > Religion & Spirituality
and to which I do not know the answer.

I really hope this helps. You are getting some VERY weird answers under Mythology & Folklore!