diff --git a/03-hamming/hamming.rb b/03-hamming/hamming.rb
index e69de29..9acda49 100644
--- a/03-hamming/hamming.rb
+++ b/03-hamming/hamming.rb
@@ -0,0 +1,17 @@
+class Hamming
+  def self.compute(a,b)
+    i = 1
+    counter = 0
+
+    if (a.length-b.length) != 0 
+      raise ArgumentError.new("First strand cannot be longer than second")
+    end
+    until (i > a.length || i > b.length)
+      if a[i-1] != b[i-1]
+        counter += 1
+      end
+      i += 1
+    end
+    return counter
+  end
+end
diff --git a/03-hamming/hamming_spec.rb b/03-hamming/hamming_spec.rb
index 4af958b..8a1a924 100644
--- a/03-hamming/hamming_spec.rb
+++ b/03-hamming/hamming_spec.rb
@@ -12,62 +12,50 @@
   end
 
   it "Check complete distance in single nucleotide strands" do
-    skip
     expect(Hamming.compute('A', 'G')).must_equal 1
   end
 
   it "Check complete distance in small strands" do
-    skip
     expect(Hamming.compute('AG', 'CT')).must_equal 2
   end
 
   it "Check small distance in small strands" do
-    skip
     expect(Hamming.compute('AT', 'CT')).must_equal 1
   end
 
   it "Check small distance" do
-    skip
     expect(Hamming.compute('GGACG', 'GGTCG')).must_equal 1
   end
 
   it "Check small distance in long strands" do
-    skip
     expect(Hamming.compute('ACCAGGG', 'ACTATGG')).must_equal 2
   end
 
   it "Check non_unique character in first strand" do
-    skip
     expect(Hamming.compute('AGA', 'AGG')).must_equal 1
   end
 
   it "Check non unique character in second strand" do
-    skip
     expect(Hamming.compute('AGG', 'AGA')).must_equal 1
   end
 
   it "Check large_distance" do
-    skip
     expect(Hamming.compute('GATACA', 'GCATAA')).must_equal 4
   end
 
   it "Check large distance in off by one strand" do
-    skip
     expect(Hamming.compute('GGACGGATTCTG', 'AGGACGGATTCT')).must_equal 9
   end
 
   it "Check Empty Strands" do
-    skip
     expect(Hamming.compute('', '')).must_equal 0
   end
 
   it "Check disallow first strand longer" do
-    skip
     expect ( proc { Hamming.compute('AATG', 'AAA') }).must_raise ArgumentError
   end
 
   it "Check disallow second strand longer" do
-    skip
     expect( proc { Hamming.compute('ATA', 'AGTG') }).must_raise ArgumentError
   end
 end