Day 2: String Reverse and Palindrome problem Ruby Implementation (#31)

* Add @aaditkamat as a contributor

* Add Ruby code for Day 1: FizzBuzz problem

* Add Ruby code for Day 2: String reverse problem

* Update README.md for Day 2

* Modify Ruby code and README

* Add condition for nil and wrong type edge cases

* Add a seperate Ruby source code file for palindrome

* Modify code for reverse.rb

* Add seperate palindrome and reverse code sections in README

* Update gitignore

* Refactor palindrome.rb and rename heading in README

Author: Aadit Kamat

.gitignore

@@ -4,4 +4,5 @@ youtube/
 Instagram/
 a.out
 .vscode/
+test/
 *.o

Day2/C++/reverse.cpp

@@ -1,5 +1,5 @@
 /**
- * @author: Rajdeep Roy Chowdhury<[email protected]> 
+ * @author: Rajdeep Roy Chowdhury<[email protected]>
  * @github: https://github.com/razdeep
  * @date: 21/12/2018
  */

Day2/README.md

@@ -332,6 +332,50 @@ void main(){
 }
 ```
 
+## Ruby Implementation
+
+### [reverse.rb](./Ruby/reverse.rb)
+
+```ruby
+=begin
+ @author: aaditkamat
+ @date: 22/12/2018
+=end
+
+def short_solution(str)
+  if str.class != String or str === nil
+    return false
+  end
+  str.reverse
+end
+
+def long_solution_iterative(str)
+  if str.class != String or str === nil
+    return false
+  end
+  reverse = ''
+  i = 0
+  until i >= str.length do
+    reverse.insert(0, str[i])
+    i += 1
+  end
+  reverse
+end
+
+def long_solution_recursive(str)
+  if str.class != String or str === nil
+    return false
+  end
+  if str === ''
+    return ''
+  end
+  temp = str[0]
+  str[0] = str[-1]
+  str[-1] = temp
+  return long_solution(str[1..-2])
+end
+```
+
 <hr />
 
 ## Part B -- Palindrome Check
@@ -613,4 +657,19 @@ if d==e:
 else:
     print("Not a pallindrome")
 ```
+## Ruby implementation
+
+### [palindrome.rb](./Ruby/palindrome.rb)
+
+```ruby
+=begin
+ @author: aaditkamat
+ @date: 22/12/2018
+=end
+require './reverse'
+
+def palindrome(str)
+  str != nil and str === short_solution(str)
+end
+```
 

Day2/Ruby/palindrome.rb

@@ -0,0 +1,9 @@
+=begin
+ @author: aaditkamat
+ @date: 22/12/2018
+=end
+require './reverse'
+
+def solution(str)
+  str != nil and str === short_solution(str)
+end

Day2/Ruby/reverse.rb

@@ -0,0 +1,36 @@
+=begin
+ @author: aaditkamat
+ @date: 22/12/2018
+=end
+
+def short_solution(str)
+  if str.class != String or str === nil
+    return nil
+  end
+  str.reverse
+end
+
+def long_solution_iterative(str)
+  if str.class != String or str === nil
+    return nil
+  end
+  reverse = ''
+  i = 0
+  until i >= str.length do
+    reverse.insert(0, str[i])
+    i += 1
+  end
+  reverse
+end
+
+def long_solution_recursive(str)
+  if str.class != String or str === nil
+    return nil
+  end
+  if str === ''
+    return ''
+  end
+  return long_solution_recursive(str[1..-1]) + str[0]
+end
+
+