static char[,] ApplyRules(char[,] input, RuleSet rules, int size)
{
var memory = input.AsMemory2D();
var panels = input.GetLength(0) / size;
var resultSize = size + 1;
var newSize = resultSize * panels;
var result = new char[newSize, newSize];
var resultSpan = result.AsSpan2D();
for (var y = 0; y < panels; y++)
{
var yOffset = y * size;
var resultYOffset = y * resultSize;
for (var x = 0; x < panels; x++)
{
var xOffset = x * size;
var resultXOffset = x * resultSize;
var target = resultSpan[resultXOffset..(resultXOffset + resultSize), resultYOffset..(resultYOffset + resultSize)];