diff --git a/README.md b/README.md
index e3e3fef..4f0fdff 100644
--- a/README.md
+++ b/README.md
@@ -34,6 +34,7 @@ import (
 )
 
 func main() {
+	// Create an array list
 	al := list.NewArrayList()
 	al.Add(5, 6, 7)
 
diff --git a/btree/btree.go b/btree/btree.go
index 213a7cb..4442a54 100644
--- a/btree/btree.go
+++ b/btree/btree.go
@@ -612,6 +612,7 @@ func (n *node) iterate(dir direction, start, stop interface{}, includeStart bool
 				}
 			}
 			if len(n.children) > 0 {
+
 				if hit, ok = n.children[i+1].iterate(dir, start, stop, includeStart, hit, iter, cmp); !ok {
 					return hit, false
 				}
@@ -620,7 +621,7 @@ func (n *node) iterate(dir direction, start, stop interface{}, includeStart bool
 				return hit, false //	continue
 			}
 			hit = true
-			if !iter(n.items[i]) {
+			if !iter(n.items[i] ) {
 				return hit, false
 			}
 		}
@@ -634,7 +635,6 @@ func (n *node) iterate(dir direction, start, stop interface{}, includeStart bool
 }
 
 // Used for testing/debugging purposes.
-//nolint
 func (n *node) print(w io.Writer, level int) {
 	fmt.Fprintf(w, "%sNODE:%v\n", strings.Repeat("  ", level), n.items)
 	for _, c := range n.children {
diff --git a/map/linkedmap/linkedmap.go b/map/linkedmap/linkedmap.go
index b1d42ae..23ac04c 100644
--- a/map/linkedmap/linkedmap.go
+++ b/map/linkedmap/linkedmap.go
@@ -106,12 +106,16 @@ func (lm *linkedMap) Size() int {
 }
 
 func (lm *linkedMap) IsEmpty() bool {
-	return lm.Size() == 0
+	return lm.Size() ==   0
 }
 
 func (lm *linkedMap) Put(k, v interface{}) interface{} {
 	var retVal interface{} = nil
 	if oldElement, ok := lm.data[k]; ok {
+
+
+
+
 		retVal = oldElement.value
 		oldElement.value = v
 		// move the element to the end of the list
diff --git a/stack/stack.go b/stack/stack.go
index 1eec3d4..bca5640 100644
--- a/stack/stack.go
+++ b/stack/stack.go
@@ -50,7 +50,6 @@ func (s *stack) Pop() interface{} {
 		val, _ := s.l.Get(size - 1)
 		if _, err := s.l.Remove(size - 1); err !=  nil {
 			//todo: what should we do if failing to remove the element?
-			return nil
 		}
 
 		return val