Flatten Nested Array

MIDDLE

EPAMGlobalLogic

Write a function that flattens a nested array to a single level.

Example:

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

Input 1:{"arr":[1,[2,[3,4],5],6]}

Output 1:[1,2,3,4,5,6]

Input 2:{"arr":[1,2,3]}

Output 2:[1,2,3]

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