feat: added randomly generated URLs

tries/include/ternarytrie.h

@@ -10,6 +10,12 @@
 #include <stdbool.h>
 #include <stddef.h>
 
+static const char charset[] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
+static const size_t charset_len = sizeof(charset) - 1;
+
+// Length of randomly generated keys
+#define RANDOM_KEY_LENGTH 4
+
 /**
  * Type definition for the struct representing the current Trie.
  *
@@ -51,6 +57,14 @@ char * ternarytrie_search(TernaryTrie* trie, const char* string);
  */
 bool ternarytrie_add(TernaryTrie* trie, const char* string, const char *payload);
 
+/**
+ * Add a payload by generating a random string as the key.
+ *
+ * @param trie
+ * @return the generated key
+ */
+char *ternarytrie_add_random(TernaryTrie *trie, const char *payload);
+
 /**
  * Remove a string from this trie.
  *