Write a function named multTable that accepts a reference to a grid of integers and a maximum integer max as a parameter and turns the grid into a multiplication table of size max x max where each index [i][j] contains the product of i and j for all cells in the grid.
If the grid is not the proper size, it must be resized.
For example, if passed a max of 5, change the grid to store:
col 0 1 2 3 4
row
0 {{0, 0, 0, 0, 0},
1 {0, 1, 2, 3, 4},
2 {0, 2, 4, 6, 8},
3 {0, 3, 6, 9, 12},
4 {0, 4, 8, 12, 16}}
