Create a function that changes specific words into emoticons. Given a sentence as a string, replace the words smile, grin, sad and mad with their corresponding emoticons.
| word | emoticon |
|---|---|
| smile | :D |
| grin | :) |
| sad | :( |
| mad | :P |
emotify("Make me smile") ➞ "Make me :D"
emotify("Make me grin") ➞ "Make me :)"
emotify("Make me sad") ➞ "Make me :("