restructured files #7
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"I added keyboard shortcuts for new, open, save, and exit functionalities. Also implemented a custom flag to track text modifications and a prompt for unsaved changes on exit. I also saw that the code was using global, which is discouraged in object-oriented design. So, I encapsulated text and file into instance variables (i.e., self.text and self.file). This improves the maintainability and avoids the use of global. "