Question about Story Editing

[Ninja In The Night]

I have found some very nice stories on DeviantArt, sadly, the quality of writing in these stories are far below par & am working on fixing the many grammar, spelling, & overall errors of the story, (*Example: He/She spelled necklace as neckless*). If I were to post the story here, along with his name under caption under the title, giving him full credit for the story, along with the link to where I had first seen the story originally, would I get in trouble for doing so? However, I do want to add the stories overall enjoyment was great, I am just a perfectionist & can't stand to see a good piece of writing go to waste.