Implement function factorial
factorial(3); // 3 * 2 * 1 = 6
factorial(5); // 5 * 4 * 3 * 2 * 1 = 120
factorial(0); // 18-factorial
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Implement function factorial
factorial(3); // 3 * 2 * 1 = 6
factorial(5); // 5 * 4 * 3 * 2 * 1 = 120
factorial(0); // 1