R
Combined tests
4 => IV
5 => V
6 => VI
9 => IX
Changed if statements to method calls.
10 => X
Changed multiple calls to a for loop
Changed for loops to while
Removed extra logic for 1-3
Added some test cases to prove it works for existing characters
40 => XL
50 =>
Added case over 50
Added cases for characters up to and over 1000 (only array needed updating)