How does dickens present the changes in Scrooge in the novel as a whole?

In the beginning of the novel Ebenezer Scrooge is portrayed as a hardhearted and unsociable man. However at the end of the novel we see dramatic changes in him as a trio of ghostly visitations causes a complete change in him. Scrooges transformed from an unpleasant and penny-pinching character to a charitable kind man.

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So the passage is about the comic mask is ugly