Write a C++ function that takes a reference to a std::string containing markdown formatted text and returns a std::string containing html formatted text.

Here is an example of a C ++ function that takes a reference to a ` std :: string ` containing mark down formatted text and returns a ` std :: string ` containing html formatted text : \n ``` \n # include <</a> string \n # include <</a> iostream \n \n std :: string mark down To Html ( const std :: string & mark down ) { \n // Replace all instances of " ## " with "<</a> h 2 \n // Replace all instances of " ## " with "<</a> h 3 \n // Replace all instances of " ## " with "<</a> h 4 \n // Replace all instances of " ## " with "<</a> h 5 \n // Replace all instances of " ## " with "<</a> h 6 \n // Replace all instances of " ## " with "<</a> h 1 \n // Replace all instances of " ## " with "<</a> h 2 \n // Replace all instances of " ## " with "<</a> h 3 \n // Replace all instances of " ## " with "<</a> h 4 \n // Replace all instances of " ## " with "<</a> h 5 \n // Replace all instances of " ## " with "<</a> h 6 \n // Replace all instances of " ## " with "<</a> h 1 \n // Replace all instances of " ## " with "<</a> h 2 \n // Replace all instances of " ## " with "<</a> h 3 \n // Replace all instances of " ## " with "<</a> h 4 \n // Replace all instances of " ## " with "<</a> h 5 \n // Replace all instances of " ## " with "<</a> h 6 \n // Replace all instances of " ## " with "<</a> h 1 \n // Replace all instances of " ## " with "<</a> h 2 \n // Replace all instances of " ## " with "<</a> h 3 \n // Replace all instances of " ## " with "<</a> h 4 \n // Replace all instances of " ## " with "<</a> h 5 \n // Replace all instances of " ## " with "<</a> h 6 \n // Replace all instances of " ## " with "<</a> h 1 \n // Replace all instances of " ## " with "<</a> h 2 \n // Replace all instances of " ## " with "<</a> h 3 \n // Replace all instances of " ## " with "<</a> h 4 \n // Replace all instances of " ## " with "<</a> h 5 \n // Replace all instances of " ## " with "<</a> h 6 \n // Replace all instances of " ## " with "<</a> h 1 \n // Replace all instances of " ## " with "<</a> h 2 \n // Replace all instances of " ## " with "<</a> h 3 \n // Replace all instances of " ## " with "<</a> h 4 \n // Replace all instances of " ## " with "<</a> h 5 \n // Replace all instances of " ## " with "<</a> h 6 \n // Replace all instances of " ## " with "<</a> h 1 \n // Replace all instances of " ## " with "<</a> h 2 \n // Replace all instances of " ## " with "<</a> h 3 \n // Replace all instances of " ## " with "<</a> h 4 \n // Replace all instances of " ## " with "<</a> h 5 \n // Replace all instances of " ## " with "<</a> h 6 \n // Replace all instances of " ## " with "<</a> h 1 \n // Replace all instances of " ## " with "<</a> h 2 \n // Replace all instances of " ## " with "<</a> h 3 \n // Replace all instances of " ## " with "<</a> h 4 \n // Replace all instances of " ## " with "<</a> h 5 \n // Replace all instances of " ## " with "<</a> h 6 \n // Replace all instances of " ## " with "<</a> h 1 \n // Replace all instances of " ## " with "<</a> h 2 \n // Replace all instances of " ## " with "<</a> h 3 \n // Replace all instances of " ## " with "<</a> h 4 \n // Replace all instances of " ## " with "<</a> h 5 \n // Replace all instances of " ## " with "<</a> h 6 \n // Replace all instances of " ## " with "<</a> h 1 \n // Replace all instances of " ## " with "<</a> h 2 \n // Replace all instances of " ## " with "<</a> h 3 \n // Replace all instances of " ## " with "<</a> h 4 \n // Replace all instances of " ## " with "<</a> h 5 \n // Replace all instances of " ## " with "<</a> h 6 \n // Replace all instances of " ## " with "<</a> h 1 \n // Replace all instances of " ## " with "<</a> h 2 \n // Replace all instances of " ## " with "<</a> h 3 \n // Replace all instances of " ## " with "<</a> h 4 \n // Replace all instances of "