static void Main(string[] args)
{
var items = new List <string> {
"a", "b", "2", "1"
};
var stack = new CircularStack(items);
$"initial state: {stack.GetState()}".Dump();
stack.Push("c");
$"push('c') state: {stack.GetState()}".Dump();
stack.Push("d");
$"push('d') state: {stack.GetState()}".Dump();
$"pop() yields: {stack.Pop()}".Dump();
$"pop() state: {stack.GetState()}".Dump();
$"pop() yields: {stack.Pop()}".Dump();
$"pop() state: {stack.GetState()}".Dump();
}
