Fill Matrix Safely

********************************************************************************* There is one integer denoted by $N$. Your task is to fill the $N × N$ two dimensional matrix $mat[N][N]$, where every $mat[i][j]$ element contains a value $ ( ( i ) × ( j ) )$ $modulo$ $N$, assuming $i$ and $j$ are index value of matrix starting from $1$ to $n$. Please note $N$ is special positive integer who’s squa