Determine if an integer is even or odd. Return true if the number is even, false if odd. Return null if the input is null.
Examples:
Input: number = 4
Output: true
Explanation: 4 is divisible by 2, so it's even
Input: number = 7
Output: false
Explanation: 7 is not divisible by 2, so it's odd
Input: number = null
Output: null
Explanation: Null input returns null
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