(Algebra: multiply two matrices) Write a function to multiply two matrices a and b and save the result in c.

The header of the function is
const int N = 3 ;
void multiplyMatrix(const double a[][N],
const double b[][N], double c[][N]);
Each element cij is ai1 ×b1j + ai2 ×b2j + ai3 ×b3j.
Write a test program that prompts the user to enter two 3×3 matrices and displays their product. Here is a sample run:

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