diff --git a/src/include/strings.cpp b/src/include/strings.cpp
index e9bfa50cc..0efcd3a3b 100755
--- a/src/include/strings.cpp
+++ b/src/include/strings.cpp
@@ -1038,6 +1038,17 @@ TString & TString::add_front(const char * s)
 	return *this;
 }
 
+TString& TString::add_back(const char* s)
+{
+	return operator<<(s);
+}
+
+TString& TString::add_front_and_back(const char* front, const char* back)
+{
+	add_front(front);
+	return add_back(back);
+}
+
 // Certified 90%
 word TString::hash() const
 {
diff --git a/src/include/strings.h b/src/include/strings.h
index b1a8802f3..9e8663597 100755
--- a/src/include/strings.h
+++ b/src/include/strings.h
@@ -77,6 +77,7 @@ public:
   // @cmember Ritorna un riferimento al carattere i-esimo della stringa
   char& operator[](int i)
   { 
+    CHECKD(i >= 0 && i <= _size, "Bad string subscript: ", i);
     CHECKD(i >= 0 && i <= _size, "Bad string subscript: ", i);
     return _str[i]; 
   }
@@ -161,6 +162,12 @@ public:
   TString& insert(const char* s, int pos = 0);
 	// @cmember Aggiunge la stringa passata davanti
 	TString& add_front(const char* s);
+	// @cmember Aggiunge la stringa passata dietro, sta funzione non serve a un tubo, solo per rendere pił bello il codice se chiamata con add_front
+	TString& add_back(const char* s);
+	// @cmember Aggiunge la prima stringa passata davanti e la seconda dietro
+	TString& add_front_and_back(const char * front, const char* back);
+	// @cmember Aggiunge la stringa passata davanti e dietro
+	TString& add_front_and_back(const char * s) { return add_front_and_back(s, s); }
 
   // @cmember Elimina tutti i caratteri contenuti in k
   TString& strip(const char* k);