In some way, I wonder about your question. This is a very specific question and a correct and accurate answer can be given by Intersystems only. If you take a look on the articles here, the most of them are about other lanuages, new technologies etc. but none of Cache/IRIS internals. If you look on the questions, very often they start with "I'm new to ISC technologies, need some help". Do you really expect an answer from an newbe? Or you really expect an answer from a Kubernetes, Phyton, Angular etc. developer? On the other hand, you are an Intersystems employee, so why don't ask somebody from the developer department? What about contacting WRC? I would be ashamed to ask such a question here.

It seems, you rotate to the left instead to the right...

My solution, assuming that B is originated from A by some number of left or right rotations

ClassMethod RotationRight(a As %String, b As %String) As %Integer
{
    f i=0:1 ret:$e(a_a,$l(a)+1-i,*-i)=b i
}
    
ClassMethod RotationLeft(a As %String, b As %String) As %Integer
{
    f i=0:1 ret:$e(a_a,i+1,$l(a)+i)=b i
}

write ##class(%Dictionary.MethodDefinition).%OpenId("...||Rotate...").Implementation.Size

gives  40 (for RotateRight) and 38 (for RotateLeft).

I have no idea, from which error you talk.

ClassMethod MyRequest()
{
	set req = ##class(%Net.HttpRequest).%New()
	set req.Server = "msedgewebdriverstorage.blob.core.windows.net"
	set req.SSLConfiguration="Open"
	set req.Https=1
	do req.Get("/edgewebdriver/?comp=list")
	set rsp=req.HttpResponse
	
	if rsp.StatusCode=200 {
		write "Data Size: ",rsp.Data.Size,!
		write "Dumping the first 256 bytes..." zzdump rsp.Data.Read(256)
		
	} else {
		write "Return Code: ",rsp.StatusCode,!
		write "Resp.Phrase: ",rsp.ReasonPhrase,!
	}
	
	quit rsp
}

The output is just fine... no errors.

do ##class(...).MyRequest() --->

Data Size: 1832857
Dumping the first 256 bytes...
0000: EF BB BF 3C 3F 78 6D 6C 20 76 65 72 73 69 6F 6E         <?xml version
0010: 3D 22 31 2E 30 22 20 65 6E 63 6F 64 69 6E 67 3D         ="1.0" encoding=
0020: 22 75 74 66 2D 38 22 3F 3E 3C 45 6E 75 6D 65 72         "utf-8"?><Enumer
0030: 61 74 69 6F 6E 52 65 73 75 6C 74 73 20 43 6F 6E         ationResults Con
0040: 74 61 69 6E 65 72 4E 61 6D 65 3D 22 68 74 74 70         tainerName="http
0050: 73 3A 2F 2F 6D 73 65 64 67 65 77 65 62 64 72 69         s://msedgewebdri
0060: 76 65 72 73 74 6F 72 61 67 65 2E 62 6C 6F 62 2E         verstorage.blob.
0070: 63 6F 72 65 2E 77 69 6E 64 6F 77 73 2E 6E 65 74         core.windows.net
0080: 2F 65 64 67 65 77 65 62 64 72 69 76 65 72 2F 22         /edgewebdriver/"
0090: 3E 3C 42 6C 6F 62 73 3E 3C 42 6C 6F 62 3E 3C 4E         ><Blobs><Blob><N
00A0: 61 6D 65 3E 31 30 30 2E 30 2E 31 31 35 34 2E 30         ame>100.0.1154.0
00B0: 2F 65 64 67 65 64 72 69 76 65 72 5F 61 72 6D 36         /edgedriver_arm6
00C0: 34 2E 7A 69 70 3C 2F 4E 61 6D 65 3E 3C 55 72 6C         4.zip</Name><Url
00D0: 3E 68 74 74 70 73 3A 2F 2F 6D 73 65 64 67 65 77         >https://msedgew
00E0: 65 62 64 72 69 76 65 72 73 74 6F 72 61 67 65 2E         ebdriverstorage.
00F0: 62 6C 6F 62 2E 63 6F 72 65 2E 77 69 6E 64 6F 77         blob.core.window

You have to work with the Data property of the response object (which is a 1.8MB  stream)

For Task2 (hamming distance) and Task5 (double chars) there is also a solution without using a (for, while, etc.) loop .

Or just simply

"The problem with computers is, that they always do what we tell them to do and not what we want."

COS does not have a pointer operator so instead of "unsigned *rx and *tx" (those are char arrays) in COS you can use string variables. By the way, C counts from 0 to N-1, COS counts from 1 to N, where N ist the size of the character array respectively the length of the string.

Class DC.CtoCOS [ Abstract ]
{

/// Encode a whole string (and return a string)
/// Use the below $ziswide(str) function to check for allowed characters
ClassMethod Encode(str As %String) As %String
{
	f i=$l(str):-1:1 s $e(str,i)=$c($a(str,i)#16+32, $a(str,i)\16+32)
	q str
}

/// Decode a whole string (and return a string)
/// Use the below $match(str,...) function to check for allowed characters
ClassMethod Decode(str As %String) As %String
{
	f i=$l(str):-2:1 s $e(str,i-1,i)=$c($a(str,i)-32*16+$a(str,i-1)-32)
	q str
}

/// Encode a characyter into a string (variable)
/// Use: do ##class(...).Encode1("A", .res)
///      write res --> !$
ClassMethod Encode1(chr As %String, chrs As %String)
{
	i $ziswide(chr) throw ##class(%Exception.General).%New("WIDE",,,chr)
	s chrs=$c($a(chr)#16+32, $a(chr)\16+32)
}

/// Encode an integer (byte value) and return a string
/// Use: write ##class(...).Encode2("A") --> !$
ClassMethod Encode2(val As %Integer) As %String
{
	i val>255 throw ##class(%Exception.General).%New("WIDE",,,val)
	q $c($a(val)#16+32, $a(val)\16+32)
}

/// Decode two characters and return one character
/// Use: write ##class(...).Decode1("!$") --> A
ClassMethod Decode1(chrs As %String) As %String
{
	i $match(chrs,"[ -/]{2}") q $c($a(chrs,2)-32*16+$a(chrs)-32)
	throw ##class(%Exception.General).%New("RANGE",,,chrs)
}

/// Decode two characters and return an integer
/// Use: write ##class(...).Decode2("!$") --> 65
ClassMethod Decode2(chrs As %String) As %Integer
{
	i $match(chrs,"[ -/]{2}") q $a(chrs,2)-32*16+$a(chrs)-32
	throw ##class(%Exception.General).%New("RANGE",,,chrs)
}

}