Hi, my problem is the following:

```
fn get_submatrix(m: [[f32; 3]; 3], (row, column): (usize, usize)) -> [[f32; 2]; 2] {
let mut result = [[0.0; 2]; 2];
for i in 0..3 {
for j in 0..3 {
if !(i == row || j == column) {
if let Some(number) = result.iter_mut().flatten().next() {
*number = m[i][j];
}
}
}
}
result
}
fn main() {
let m = [[1.0, 1.0, 1.0],
[3.0, 2.0, 1.0],
[7.0, 3.0, 100.0],];
let m3 = get_sub(m, (0, 0));
println!("m3: {:?}", m3);
}
```

why the pointer in the `result`

array don't advance in the iteration???