add parethesis support

1 files changed, 1 insertions, 0 deletions

diff --git a/tree.h b/tree.h
index 8df9f53..c18ccae 100644
--- a/tree.h
+++ b/tree.h
@@ -23,5 +23,6 @@ typedef struct node {
 node * parse(char *str);
 void fprintTree(FILE *stream, node *root, int level);
 void printTree(node *root, int level);
+void free_node(node *n);
 
 #endif