fix memory leaks

alib2/src/alphabet/Symbol.cpp

@@ -21,7 +21,7 @@ Symbol::Symbol(const Symbol& other) : symbol(other.getSymbol().clone()) {
 }
-Symbol::Symbol(Symbol&& other) noexcept : symbol(std::move(other.getSymbol()).plunder()) {
+Symbol::Symbol(Symbol&& other) noexcept : symbol(other.symbol) {
 	other.symbol = NULL;
 }

alib2/src/label/Label.cpp

@@ -21,7 +21,7 @@ Label::Label(const Label& other) : label(other.getLabel().clone()) {
 }
-Label::Label(Label&& other) noexcept : label(std::move(other.getLabel()).plunder()) {
+Label::Label(Label&& other) noexcept : label(other.label) {
 	other.label = NULL;
 }