Code Golf: Binary encoding!

Time for another round of code golf!

Develop a function that performs a two-step encryption process on a given string:

• First Step: Reverse Cipher

  • Reverse the entire input string.
  • Relocate the last character of the original string (now the first character of the reversed string) to the end.

• Second Step: Alphabetic Index Binary Encoding

  • For each alphabetic character, determine its zero-based index in the lowercase alphabet (a-z).
  • Replace odd-indexed characters with '1' and even-indexed characters with '0'.
  • Preserve non-alphabetic characters unchanged.

Example:

encrypt("Hello World!") should return "11100 01101!"

Explanation:

1. Reverse Cipher: "Hello World!" becomes "dlroW olleH!"
2. Binary Encoding:
   • 'd' (index 3) -> 1
   • 'l' (index 11) -> 1
   • 'r' (index 17) -> 1
   • 'o' (index 14) -> 0
   • 'W' (index 22) -> 0
     ... and so on.

Your task is to implement this encryption efficiently

Notes

• The index for alphabetical characters should start from 0, with A equal to 0.
• Case is ignored, so A and a are considered the same.
• Non-alphabetical characters remain unchanged.

Rules

1. The signature of the contest entry MUST be:

   Class codeGolf.CrypticReversalBinary
   {
   
   ClassMethod Encode(Message) As %String
   {
       // Your solution here
   }
   
   }
   

2. It is forbidden to modify class/signature, including but not limited to:

   • Adding inheritance
   • Setting default argument values
   • Adding class elements (Parameters, Methods, Includes, etc).

3. It is forbidden to refer to non-system code from your entry. For example, this is not a valid entry:

   ClassMethod Build(f As %Integer)
   {
     W ##class(myPackage.myClass).test(a)
   }
   

4. The use of $ZWPACK and $ZWBPACK is also discouraged.

5. You can use this test case:

   Class codeGolf.unittests.CrypticReversalBinary Extends %UnitTest.TestCase
   {
       Method TestSolution()
       {
           Do $$$AssertEquals(##class(codeGolf.CrypticReversalBinary).Encode("abcdefg"), "1010100")
           Do $$$AssertEquals(##class(codeGolf.CrypticReversalBinary).Encode("ABCDEFG"), "1010100")
       }
   
       Method testMixedCase()
       {
           Do $$$AssertEquals(##class(codeGolf.CrypticReversalBinary).Encode("aBcDeF"), "010101")
       }
   
       Method testNumbers()
       {
           Do $$$AssertEquals(##class(codeGolf.CrypticReversalBinary).Encode("123"), "321")
       }
   
       Method testPunctuation()
       {
           Do $$$AssertEquals(##class(codeGolf.CrypticReversalBinary).Encode("a!b@c#"), "0@1!0#")
       }
   
       Method testSpaces()
       {
           Do $$$AssertEquals(##class(codeGolf.CrypticReversalBinary).Encode("a b c"), " 1 00")
       }
   
       Method testLongWord()
       {
           Do $$$AssertEquals(##class(codeGolf.CrypticReversalBinary).Encode("supercalifragilisticexpialidocious"), "0000010100110001001000110100101000")
       }
   
       Method testSentence()
       {
           Do $$$AssertEquals(##class(codeGolf.CrypticReversalBinary).Encode("The quick brown fox jumps over the lazy dog."), "001 0101 011 1010 01001 101 10011 00000 011.")
       }
   
       Method testSpecialCharacters()
       {
           Do $$$AssertEquals(##class(codeGolf.CrypticReversalBinary).Encode("!@#$%^&*()')", "')(*&^%$#@!)")
       }
   }