Im trying to follow the matrix multiplication Mojo is using

From this post:

Function is giving me an error, is there another way, better way?

```
fn unrollSimdMatrixMultiply(C: anytype, A: anytype, B: anytype) void {
const N = B.len;
const vec_len = 32;
for (C, A) |*C_row, *A_row| {
var j: u32 = 0;
while (j <= N - vec_len) : (j += vec_len) {
for (0..N) |k| {
const u: @Vector(vec_len, f64) = B[k][j..][0..vec_len].*;
const y: @Vector(vec_len, f64) = C_row.*[j..][0..vec_len].*;
const w: @Vector(vec_len, f64) = @splat(vec_len, A_row.*[k]);
const slice: [vec_len]f64 = (u * w) + y;
@memcpy(C_row.*[j .. j + vec_len], &slice);
}
}
while (j < N) : (j += 1) {
for (0..N) |k| {
C_row.*[j] += A_row.*[k] * B[k][j];
}
}
}
}
```