From a35683d01918b506d25d941bd58a44993b05d286 Mon Sep 17 00:00:00 2001
From: "engr.hasanuzzaman" <hasanuzzaman.sumon@gmail.com>
Date: Wed, 19 Feb 2020 23:52:28 +0600
Subject: [PATCH 1/2] Implement basic queue with ruby

---
 problems/queue/queue.rb | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 problems/queue/queue.rb

diff --git a/problems/queue/queue.rb b/problems/queue/queue.rb
new file mode 100644
index 00000000..519bf28d
--- /dev/null
+++ b/problems/queue/queue.rb
@@ -0,0 +1,24 @@
+#!/usr/bin/env ruby
+
+class Queue
+    def initialize
+        @queue = []
+    end 
+    
+    def add(val)
+        @queue << val
+    end
+
+    def remove
+        @queue.shift
+    end
+end
+
+q = Queue.new
+q.add(1)
+q.add(2)
+q.add(3)
+puts q.remove()
+puts q.remove()
+puts q.remove()
+puts q.remove()

From 63ae51a8bed1d92dfca9a2b864a72a7c688c04eb Mon Sep 17 00:00:00 2001
From: "engr.hasanuzzaman" <hasanuzzaman.sumon@gmail.com>
Date: Thu, 20 Feb 2020 00:42:49 +0600
Subject: [PATCH 2/2] Solve substrings problem

---
 problems/substrings/substrings.rb | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100644 problems/substrings/substrings.rb

diff --git a/problems/substrings/substrings.rb b/problems/substrings/substrings.rb
new file mode 100644
index 00000000..f124a6d0
--- /dev/null
+++ b/problems/substrings/substrings.rb
@@ -0,0 +1,15 @@
+#!/usr/bin/env ruby
+
+def sub_strings(str)
+  sub_strs = str.split('')
+
+  str.size.times do |i|
+    for j in (i+1...str.size)
+      sub_strs << str[i..j]
+    end
+  end
+
+  sub_strs
+end
+
+puts sub_strings('abc').inspect
\ No newline at end of file