(1) if a user's input string matches a known text message abbreviation, output the unabbreviated form, else output: unknown. support two abbreviations: lol -- laughing out loud, and idk -- i don't know. (4 pts)

sample input/output:

input an abbreviation: lol

laughing out loud

(2) expand to also decode these abbreviations. (3 pts)

bff -- best friends forever

imho -- in my humble opinion

tmi -- too much information