Today we received two new exercises for file handling from a new Ziglings contributor. And they are not easy. 
I wish you lots of fun!
// Until now, we've only been printing our output in the console,
// which is good enough for fighting alien and hermit bookkeeping.
//
// However, many other task require some interaction with the file system,
// which is the underlying structure for organizing files on your computer.
//
// The File System provide a hierarchical structure for storing files
// by organizing files into directories, which hold files and other directories,
// thus creating a tree structure for navigating.
//
// Fortunately, zig standard library provide a simple api for interacting
// with the file system, see the detail documentation here
//
// https://ziglang.org/documentation/master/std/#std.fs
//
// In this exercise, we'll try to
// - create a new directory
// - open a file in the directory
// - write to the file.