A square matrix grid is defined as an X Matrix if both of the following conditions are satisfied:

1. Every element on both the main diagonal and the secondary diagonal is non-zero (not equal to $0$).

2. Every element that is not on either diagonal is equal to $0$.

Given a two-dimensional integer array grid of size n × n, return true if grid is an X Matrix, or false otherwise.

Constraints:

• n $=$ grid.length $=$ grid[i].length

• $3 \leq$ n $\leq 100$

• $0 \leq$ grid[i][j] $\leq 10^5$

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