exo5: Add the code that permit to build a word counter.
-rw-r--r-- 213 .gitignore
drwxr-xr-x - exo1
drwxr-xr-x - exo2
drwxr-xr-x - exo3
drwxr-xr-x - exo4
drwxr-xr-x - exo5