Implemented a inifinity loop which is leaved when the user want to close the program (user input).
Changed the printMessage method because i do not need to check for other types as stringer and default.
Added a grpahviz_util.go file and implemented the skeleton for a test.
Take care that only ipv4 addresses are added when a hostname is resolved.
Added the HandleGraphvizFile.go and a test for the filehandler package.