Write an alternative gcd function based on the following observations (arrange so that a > b):  a. gcd(a, b) = 2gcd(a/2, b/2) if a and b are both even.  b. gcd(a, b) = gcd(a/2, b) if a is even and b is odd.  c. gcd(a, b) = gcd(a, b/2) if a is odd and b is even.  d. gcd(a, b) = gcd((a + b)/2, (a − b)/2) if a and b are both odd. Write a main function to test your gcd function.

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Use of XOR function

XOR function or exclusive OR function was introduced in Excel 2013. This function is available under excel logical functions. For the given statement, the XOR function will return true only when either of the statements is true. It returns false when both the statements are true or when both the statements are false.