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I have a program please help

Write a program that contains:
1. change_case() This function switches the casing of all letters in a word/phrase passed to it. All uppercase letters should become lowercase, and all lowercase letters should become uppercase. If the letter is a space or a number or a symbol it should remain unchanged. The word/phrase, as it has been changed, should be used everywhere else in the program.
2. display_backwards() This procedure should receive the phrase. It should then display the message backwards with the phrase "Program says: " in front of it, to a user.
Example: If the phrase is "To Infinity and Beyond" the program should display
Program says: DNOYEb DNA YTINIFNi OOt
Call the functions and procedures to display: "To Infinity and Beyond"


Hey, what language are you using? It also would be good if you shared the repl where you are trying to do that, so I can see your code