Added a new file with some utils I use to be able to do a switch with strings

Added my name to the list of authors

I think I can still improve some of the content of the cases (I can see three really similar).

Simplified return

Refactored a piece of code repeated three time. 

Refactored a piece of code repeted three time. Created a function to replace this duplication of code.

- flushing stdout is what we need here

changes in Mhwd files