Given two integers A and B. Your task is to return their product.
A = 1, B = 2
Multiplication of 1 and 2 is 2.
A = 8, B = 7
Multiplication of 8 and 7 is 56.
You don't need to read input or print anything. Your task is to complete the function multiplication() which takes two integers a and b and returns their product.
Expected Time Complexity: O(1)
Expected Auxiliary Space: O(1)
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