Create a file to list cat's voices
Change "nyan" to "meow"
add two files of dog's and chicken's voices
Delete boo.txt
Rename two files to bow.txt and mew.txt
Move two files to animal folder
Change a dog voice from wan to bow.
Add a file of cow's voice.
Merge branch 'my_first_branch'
Merge remote-tracking branch 'origin/master'