ITP - exercises - exercise - 16

Take the following array:

a = ['white snow', 'winter wonderland', 'melting ice',
     'slippery sidewalk', 'salted roads', 'white trees']

and turn it into a new array that consists of strings containing one
word. (ex. ["white snow", etc...] → ["white", "snow", etc...]. Look into
using Array's map and flatten methods, as well as String's split method.