Finished implementing the stackstack

tests/stack.nim

@@ -110,6 +110,8 @@ suite "Stack":
     check empty.data[1] == 0
     check empty.data[2] == 0
     check empty.data[3] == 0
+    empty[].Transfert(empty2[], 32)
+    check empty.size == 64
     empty = NewStack()
     var some = NewStack()
     some[].Push(2)

tests/stackStack.nim

@@ -22,6 +22,14 @@ suite "StackStack":
     empty[].Push(3)
     empty[].Clear()
     check empty[].Pop() == 0
+  test "Duplicate":
+    var empty = NewStackStack()
+    empty[].Clear()
+    check empty[].Pop() == 0
+  test "Swap":
+    var empty = NewStackStack()
+    empty[].Swap()
+    check empty[].Pop() == 0
   test "Begin":
     var empty = NewStackStack()
     empty[].Begin((1, 2))