Flattening list

Given a list with multiple list elements, the final function needs to flatten the list to ensure that the list does not contain list elements.

Sample Code:

def flatArr(l):
# Enter your logic here...

Examples:

Input: [[1],[4,5],['numbers']]
Output: [1,4,5,"numbers"]
Explanation: The list has been flattened.

Input: [[1,2,3],[3,4,5]]
Output: [1,2,3,3,4,5]
Explanation: The list has been flattened.

Test Case	Input	Expected Output
Test Case 1	[[1],[4,5],['numbers']]	[1,4,5,"numbers"]
Test Case 2	[[1,2,3],[3,4,5]]	[1,2,3,3,4,5]

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