Flatten Nested Array

Create a function that takes a nested array of arbitrary depth and returns a flattened array where all nested elements are extracted and placed in a single array.

Example Inputs & Outputs

//Example 1
Input: [1, [2, [3, 4], 5], 6]
Output: [1, 2, 3, 4, 5, 6]

//Example 2
Input: [["a"], ["b", ["c", "d"]], "e"]
Output: ["a", "b", "c", "d", "e"]

Constraints & Edge Cases

• The input array may contain numbers, strings, or other data types.
• The function should handle deeply nested arrays efficiently.
• Empty arrays should be handled correctly.
• The function should return a new array without modifying the original input.