Write a function that finds and returns the largest integer in a list. If the list is empty or null, return null.
Examples:
Input: numbers = [5, 10, 3, 8, 15]
Output: 15
Explanation: 15 is the largest number in the list
Input: numbers = [-5, -10, -3, -8, -1]
Output: -1
Explanation: -1 is the largest number in the list of negative integers
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