Added test for 2
Added test for 3
Changed convertion result format from Text to Vector
Refactored implementation
Added test for 4
Cleanup in tests, removed superfluous array construction using concatenation of ⍬
Cleanup, removed array superfluous ,⍬
Added test for 5
Added test for 6
Added test for 7
Refactored so as to re-use numeral internally
Added test for 9
Added test for 10
Added test for 11
Also fixed broken test that expected 'X'
but should have expected 'X',⍬
Added test for 40
Added test for 45
Added test for 50
Added test for 89
Added test for 90
Added test for 99