public ICandidate[] CrossOver(ICandidate parentA, ICandidate parentB, int crossOverIndex)
{
//true true, false , false, true
var piA = parentA.GetGenomes();
var piB = parentB.GetGenomes();
var childAItems = piA.Substring(0, crossOverIndex) + piB.Substring(crossOverIndex, geneCount - crossOverIndex);
var childBItems = piB.Substring(0, crossOverIndex) + piA.Substring(crossOverIndex, geneCount - crossOverIndex);
var childA = new Knapsack(childAItems);
var childB = new Knapsack(childBItems);
return(new Knapsack[] { childA, childB });
}