Write function to add and multiply two matrices. The header of the
functions is as follow:
void addMatrix( int a[][COULMN_SIZE], int b[][COULMN_SIZE],
int c[][COULMN_SIZE], int rowSize )
c matrix will hold the result of adding
void multiplyMatrix( int a[][COULMN_SIZE],
intb [][COULMN_SIZE],
int c[][COULMN_SIZE], int rowSize )
c matrix will hold the result of multiplying

