Add the search feature.

src/table.c

@@ -5,7 +5,14 @@ void table_init(table* table) {
     ht_init(&table->table);
     table->parent = NULL;
 } 
-
+table_entry* table_search(table* table, const char* string) {
+    void* to_return = NULL;
+    do {
+        to_return = ht_get(&table->table, string);
+        table = table->parent;
+    } while(table && to_return == NULL);
+    return to_return;
+}
 void table_free(table* table) {
     ht_free(&table->table);
 }