Undo Operation Tracker

Design a command interpreter that supports two commands: 'edit text' to set the text and 'undo' to revert to the last version of the text. You should implement an undo function that allows for reverting the latest edit. Input Format: A number n of commands followed by n lines of commands. Output Format: Print the final text after all commands have executed. If an undo is called first, it should print 'No previous edits' instead. Example: Input: 4 edit hello edit world undo edit there Output: there