solve hw-9

hws/tiktok_trends/StringInterner.cpp

@@ -0,0 +1,15 @@
+#include "StringInterner.h"
+
+const std::string* StringInterner::intern(const std::string& str) {
+    std::pair<std::unordered_set<std::string>::iterator, bool> result = pool.insert(str);
+    return &(*result.first);
+}
+
+const std::string* StringInterner::intern(std::string&& str) {
+     std::pair<std::unordered_set<std::string>::iterator, bool> result = pool.insert(std::move(str));
+     return &(*result.first);
+}
+
+const std::string* StringInterner::getEmptyString() {
+    return intern("");
+}