Here's the question reformatted to be more concise and direct:
Reverse String
Create code to reverse a string. For example, "hello" should become "olleh". Return an empty string if the input is empty, and null if the input is null.
Examples:
Input: str = "hello"
Output: "olleh"
Input: str = "Hi There"
Output: "erehT iH"
Input: str = ""
Output: ""
Input: str = null
Output: null
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