X622: Element in Array if Exists

Rewrite the function getElementAt() so that it returns the element nth in the array numbers, but only if there is an element at that position (it exists). If the nth element doesn't exist (e.g., outside of bounds), then the function should return the third argument notFound.

Examples:

getElementAt({89,90,91},0,-1) -> 89
getElementAt({89,90,91},4,-99) -> -99

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