public string CandidateInfo(Candidate candidate)
{
return($"X1 = {candidate.X1}, \n" +
$"X2 = {candidate.X2}, \n" +
$"X3 = {candidate.X3}, \n" +
$"Fitness = {candidate.Fitness}, \n" +
$"Average of Generation = {CurrentGeneration.Select(x => x.Fitness).Average()}\n");
}