Added test cases for converting DD/MM/YYYY to YYYY/MM/DD
Added test cases for converting DD-MM-YYYY to YYYY/MM/DD
Added test cases for converting :
D/MM/YYYY to YYYY/MM/D
DD/M/YYYY to YYYY/M/DD
D/M/YYYY to YYYY/M/D
Added test cases for converting DD/MM/YYYY to YYYY/DD/MM at start of text, middle of text, end of text
Refactored convertFormalDateTest
close #18