mautil::String myString("hello world");
int length = myString.length();
mautil::String str1("hello"); mautil::String str2("world"); mautil::String str3 = str1 + " " + str2;This creates three String objects (`str1`, `str2`, and `str3`) and then concatenates them to form the string "hello world". The Mautil library is not a standard C++ library, so it is not included in the standard C++ library package. Instead, it is a third-party library that must be downloaded and installed separately.