Implement a function rangeRight(start, end, step) that returns an array of numbers in descending order.

The function should:

• Generate numbers starting from end - 1 down to start.
• Default step to 1 if not provided.
• Handle cases where start > end by returning an empty array.
• Return an empty array if step is 0.

Examples

rangeRight(0, 5);        // [4, 3, 2, 1, 0]
rangeRight(2, 10, 2);    // [8, 6, 4, 2]
rangeRight(5, 2, -1);    // [] (invalid because start > end in descending logic)
rangeRight(3, 3);        // []