fixup! Add an operator and basic types exercise for the first day.

Author: hageboeck

exercises/basicTypes/PrintHelper.h

@@ -6,7 +6,7 @@
 #include <string>
 
 #ifdef _MSC_VER
-std::string demangle(std::string_view input) { return input; }
+std::string demangle(std::string_view input) { return std::string{input}; }
 #else
 #include <cxxabi.h>
 std::string demangle(std::string_view input) {