Add utility IsLeaf() method

Author: mramshaw

node.go

@@ -10,11 +10,8 @@ type node struct {
 	childCount int
 }
 
-func (n *node) setChildNode(newNode *node) bool {
-	//fmt.Printf("settingChildNode: %v\n", newNode)
-	n.childCount++
-	n.children = []*node{newNode}
-	return true
+func (n *node) IsLeaf() bool {
+	return n.childCount == 0
 }
 
 func (n *node) makeChildNode(s string) *node {
@@ -29,6 +26,13 @@ func (n *node) makeChildNode(s string) *node {
 	return &child
 }
 
+func (n *node) setChildNode(newNode *node) bool {
+	//fmt.Printf("settingChildNode: %v\n", newNode)
+	n.childCount = 1
+	n.children = []*node{newNode}
+	return true
+}
+
 func makeNode(s string) node {
 	//fmt.Printf("makingNode: %s\n", s)
 	return node{value: s, childCount: 0}