remove duplicates lines in a buffer

[GH]

A program give me huge logs with duplicated lines
I _need_ to simplify this huge file removing duplicated lines.

any tool to do it? maybe a func?

I think in a function that do a list with lines maybe using

  (push (NEWELT PLACE)) ...

in a while cycle

but dont push a line if it exist in the list, maybe checking it with

    (dolist ...)

then to write the list in a new buffer