Improve print tree graph

print_helper.c

@@ -54,6 +54,7 @@ void print_char(unsigned char c)
 void print_tree(struct tree *parent)
 {
 	int level = 1;
+	printf("Showing tree\n");
 	while (parent->left != NULL ) {
 		if (parent->right) {
 			for (int i = 0; i < level; i++)
@@ -66,7 +67,7 @@ void print_tree(struct tree *parent)
 		}
 		printf("o\n");
 
-		if (parent->left && parent->left->ch != 0) {
+		if (parent->left && !parent->left->left) {
 			for (int i = 0; i < level; i++)
 				printf(" ");
 			print_char(parent->left->ch);