Implement a function to reverse an integer. Given an integer, return the integer with its digits reversed.

Examples:

Input: num = 123 Output: 321 Explanation: Reversing the digits 1, 2, 3 gives 321 Input: num = -456 Output: -654 Explanation: The sign remains the same, only the digits are reversed Input: num = 1000 Output: 1 Explanation: Leading zeros in the result are removed
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