In C Write a function that computes the Greatest Common Divisor of two long integers: long gcd(long a, long b); Recall that the gcd of two integers is gcd(a,0) = a gcd(a,b) = gcd(b, a%b) Put this function in a file called gcd.c. This will be a tiny file. Assume that the two integers are zero or positive. The function must be a pure function and must be in its own file. Create a separate source file that contains main for debugging. Compile and run by: C:\Source\>gcc gcdTester.c gcd.c C:\Source\>.\a.exe Enter a: 25 Enter b: 15 The gcd is 5 Include a function prototype (as above) for gcd in the file gcdTester.c