Fix timerGetSource() returning a string without a null terminator

src/module/timer.c

@@ -63,6 +63,7 @@ char* timerGetSource()
   size_t length = strlen(timerLibSource);
   char* copy = (char*)malloc(length + 1);
   strncpy(copy, timerLibSource, length);
+  copy[length] = '\0';
   
   return copy;
 }