add " User Instructions B" and a new function 
add " User Instructions B" and a new function 

input: Any of January, january, janNuAry, jaN, jaNu,jaNuA,jaNuAr output "January". If Jbnuary or "", return None
无论输入January, january, janNuAry, jaN, jaNu,jaNuA,jaNuAr,都输出January. 如果是Jbnuary或者""，则返回None
roy2020china/BingDemo