Implement Ramzay cipher

lib/Ramzay.rb

@@ -0,0 +1,50 @@
+class Ramzay
+  def self.encrypt (str)
+    matrix = [['s','i','o','e','r','a','t','n','-','-'],
+              ['c','x','u','d','j','p','z','b','k','q'],
+              ['.','w','f','l','/','g','m','y','h','v']]
+    str = str.gsub(/ /,'/')
+    arr =""
+    str.each_byte do |c|
+      matrix.each_with_index do |row, i|
+        row.each_with_index do |a, j|
+          if c.chr==a
+            if i==0
+              arr<<j.to_s
+            else
+              arr<<(i+7).to_s+j.to_s
+            end
+          end
+        end
+      end
+    end
+    arr
+  end
+
+  def self.decrypt(str)
+    matrix = [['s','i','o','e','r','a','t','n','-','-'],
+              ['c','x','u','d','j','p','z','b','k','q'],
+              ['.','w','f','l','/','g','m','y','h','v']]
+    txt = ""
+    j = 0
+    str.each_byte do |c|
+      d = c.chr.to_i
+      if j==0
+        if d<8
+          txt+=matrix[0][d]
+          j = 0
+        else
+          if d == 8
+            j = 1
+          else
+            j = 2
+          end
+        end
+      else
+        txt+=matrix[j][d]
+        j=0
+      end
+    end
+    txt
+  end
+end

lib/aaa_crypt.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 require_relative "aaa_crypt/version"
-
+require_relative "Ramzay"
 module AaaCrypt
   class Error < StandardError; end
   # Your code goes here...

test/Ramzay_test.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+require_relative "test_helper"
+
+class Ramzay_Test < Minitest::Test
+  include AaaCrypt
+
+
+  def test_ramzay_encrypt_a
+    assert_equal"5", Ramzay.encrypt('a')
+  end
+
+  def test_ramzay_encrypt_hello_world
+    assert_equal"983939329491249383",
+                Ramzay.encrypt("hello world")
+  end
+
+  def test_ramzay_decrypt_a
+    assert_equal "a", Ramzay.decrypt("5")
+  end
+
+  def test_ramzay_decrypt_hello_world
+    assert_equal"hello/world",
+                Ramzay.decrypt("983939329491249383")
+  end
+
+end