public static IEnumerable <TSource> Execute <TSource, TCondition>(this IEnumerable <TSource> source, TCondition condition, IExecutor <TSource, TCondition> executor)
{
//if (!executor.ExeutePrecondition(condition))
//{
// return source;
//}
//return source.Where((x) => executor.ExecutePostcondition(x, condition));
return(!executor.ExeutePrecondition(condition) ? source : source.Where((x) => executor.ExecutePostcondition(x, condition)));
}