Game Abbreviations C++ please

(1) If a user's input matches a known game abbreviation (COD), output the full name of the game (Call of Duty) (3 pts) Sample input/output:

Enter a game: COD Call of Duty 

(2) Expand to display Call of Duty if the abbreviation matches, else output: Unknown. Use an if/else (3 pts) Sample input/output:

Enter a game: DK Unknown 

(3) Expand to also recognize these games. Use a multi-branch (cascading) if/else. (4 pts)

GTA -- Grand Theft Auto

LL -- League of Legends

MK -- Mortal Kombat

WoW -- World of Warcraft (note the small letter 'o')