Use std::string::substr() instead of adding one character at a time. This patch also removes a few unused util functions that are easily written using substr().

include/util.h

@@ -10,8 +10,6 @@
 #include <sstream>
 
 std::string intToString(int theInt);
-std::string truncateEnd(std::string to_truncate);
-std::string removeBeginning(std::string to_remove);
 std::string replaceExEscape(std::string first, std::string search, std::string replace);
 
-#endif
+#endif