merge: Improved ROT13 function (#964)

* feat: improved memoize function

used Map instead of object & used the JSON.stringfy method for generate a valid string as a key

* docs: modified documentation

* style: format with standard

* docs: modified stringify doc

* refactor: remove two repetition implementation

* feat: added validation, test codes

* chore: remove useless words

* feat: added types for jest

* chore: added link box

* feat: added new validation test casses & methods

* style: formated with standard

* feat: added parse method & test cases

* docs: added js docs

* chore: added default import export

* feat: imporved algorithm via replace method

* test: added two test cases

* feat: added jest type for suggestions

* feat: added `reduceRight` & `trim` method

* chore: added helper variable

* feat: added new rotation option

* Revert "chore: added helper variable"

This reverts commit 489544da0a3d479910fbea020d3be3d0d10681bf.

* remove: yarn lock

* chore: fix grammer

* feat: remove revert

* chore: added new line

Ciphers/test/ROT13.test.js

@@ -0,0 +1,18 @@
+import ROT13 from '../ROT13'
+
+describe('Testing ROT13 function', () => {
+  it('Test - 1, passing a non-string as an argument', () => {
+    expect(() => ROT13(0x345)).toThrow()
+    expect(() => ROT13(123)).toThrow()
+    expect(() => ROT13(123n)).toThrow()
+    expect(() => ROT13(false)).toThrow()
+    expect(() => ROT13({})).toThrow()
+    expect(() => ROT13([])).toThrow()
+  })
+
+  it('Test - 2, passing a string as an argument', () => {
+    expect(ROT13('Uryyb Jbeyq')).toBe('Hello World')
+    expect(ROT13('ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz')).toBe('NOPQRSTUVWXYZABCDEFGHIJKLMnopqrstuvwxyzabcdefghijklm')
+    expect(ROT13('The quick brown fox jumps over the lazy dog')).toBe('Gur dhvpx oebja sbk whzcf bire gur ynml qbt')
+  })
+})