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

The function should:

• Generate numbers starting from start up to, but not including, end.
• Default step to 1 if not provided.
• Handle negative ranges if start > end.
• Return an empty array if step is 0.

Examples

range(0, 5);        // [0, 1, 2, 3, 4]
range(2, 10, 2);    // [2, 4, 6, 8]
range(5, 2, -1);    // [5, 4, 3]
range(3, 3);        // []