own statements class for mom

so we don’t have to deal with arrays (as a special case)
and use method sending as is good oo

lib/common/statements.rb

@@ -0,0 +1,27 @@
+module Common
+  #extracted to resuse
+  module Statements
+    attr_reader :statements
+    def initialize(statements)
+      @statements = statements
+    end
+
+    def empty?
+      @statements.empty?
+    end
+    def single?
+      @statements.length == 1
+    end
+    def first
+      @statements.first
+    end
+    def length
+      @statements.length
+    end
+
+    def collect(arr)
+      @statements.each { |s| s.collect(arr) }
+      super
+    end
+  end
+end