write the function of multiplying two three-by-three matrices

`#include <iostream> #include <stdio.h> using namespace std; int main() { int a[3][3], b[3][3], c[3][3]; int i, j, k; cout << "Enter matrix A" << endl; for (i = 0; i < 3; i++) { for (j = 0; j < 3; j++) { cin >> a[i][j]; } } cout << "Enter matrix B" << endl; for (i = 0; i < 3; i++) { for (j = 0; j < 3; j++) { cin >> b[i][j]; } } // init c for (i = 0; i < 3; i++) { for (j = 0; j < 3; j++) { c[i][j] = 0; } } for (i`