Fix Guti allocation

src/amf-app/amf_n1.cpp

@@ -2551,7 +2551,7 @@ void amf_n1::security_mode_complete_handle(
 
   std::string guti = mcc + mnc + amf_cfg.guami.regionID +
                      amf_cfg.guami.AmfSetID + amf_cfg.guami.AmfPointer +
-                     std::to_string(tmsi);
+                     conv::tmsi_to_string(tmsi);
   Logger::amf_n1().debug("Allocated GUTI %s", guti.c_str());
 
   // TODO: remove hardcoded values

src/ngap/ngapIEs/FiveGSTmsi.cpp

@@ -27,6 +27,7 @@
  */
 
 #include "FiveGSTmsi.hpp"
+#include "conversions.hpp"
 
 using namespace ngap;
 
@@ -46,7 +47,7 @@ bool FiveGSTmsi::decodefrompdu(Ngap_FiveG_S_TMSI_t pdu) {
   amfSetid.getAMFSetID(setId);
   amfPointer.getAMFPointer(pointer);
   _5g_s_tmsi = setId + pointer + std::to_string(tmsi);
-  tmsi_value = std::to_string(tmsi);
+  tmsi_value = conv::tmsi_to_string(tmsi);
   return true;
 }