Using one or more string methods:
Capitalize a word
word: bicycle
output: Bicycle
word: guitar
output: Guitar
word: envelope
output: Envelope
Display a word in all capital letters and all lowercase letters
word: vIoLiN
output: VIOLIN violin
Exchange all instances of a letter within a word with a different
word: Mississippi
...exchange 's' for 'z'...
output: Mizzizzippi