13 typedef struct tree_node {  struct
15   struct tree_node *left;  argument
16   struct tree_node *right;  argument
17 } tree_node;  typedef
47 void insert(tree_node *root, char *word) {  in insert()
60       tree_node *new_node = (tree_node *)malloc(sizeof(tree_node));  in insert()
70       tree_node *new_node = (tree_node *)malloc(sizeof(tree_node));  in insert()
82 void populate_dictionary(tree_node **dictionary, char *filename) {  in populate_dictionary()
92         tree_node *new_node = (tree_node *)malloc(sizeof(tree_node));  in populate_dictionary()
106 int find_word(tree_node *dictionary, char *word) {  in find_word()
122 void print_tree(tree_node *dictionary) {  in print_tree()
136   tree_node *dictionary = NULL;  in main()