Code Golf: String Rotations

Let's have a round of Code Golf!

String rotation is when you take a word and move some of its letters to the end of the word, so the first letter becomes the second letter, the second letter becomes the third, and so on. Last letter becomes first. Rotation can happen only in one direction →.
Your task is to write a method that will receive two strings. It then must return an integer value of how many times needed to rotate the strings to be equal.
As usual shortest solution wins.

Input

"hello", "llohe"

Output

3

 
​

Note

• Use this code to check the solution length

Rules

1. The signature of the contest entry MUST be:

   Class codeGolf.StringRotation
   {
       ClassMethod Rotations(a As %String, b As %String) As %Integer
       {
       // 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.StringRotation Extends %UnitTest.TestCase
   {
   
   Method TestRotation()
   {
       Do $$$AssertEquals(##class(codeGolf.StringRotation).Rotations("ABCD","CDAB"), 2)
       Do $$$AssertEquals(##class(codeGolf.StringRotation).Rotations("ABCD","ABCD"), 0)
       Do $$$AssertEquals(##class(codeGolf.StringRotation).Rotations("abcde","cdeab"), 3)
       Do $$$AssertEquals(##class(codeGolf.StringRotation).Rotations("Nun","nNu"), 1)
       Do $$$AssertEquals(##class(codeGolf.StringRotation).Rotations("Iris ","s Iri"), 2)
       Do $$$AssertEquals(##class(codeGolf.StringRotation).Rotations("goose","osego"), 3)
       Do $$$AssertEquals(##class(codeGolf.StringRotation).Rotations("o","o"), 0)
   }
   
   }