RUBY-1021 Use helper method to build string

Author: estolfo

lib/mongo/options/redacted.rb

@@ -38,9 +38,7 @@ class Redacted < BSON::Document
       #
       # @since 2.1.0
       def inspect
-        '{' + reduce([]) do |list, (k, v)|
-          list << "#{k.inspect}=>#{redact(k, v, __method__)}"
-        end.join(', ') + '}'
+        redacted_string(__method__)
       end
 
       # Get a string representation of the options.
@@ -49,9 +47,7 @@ def inspect
       #
       # @since 2.1.0
       def to_s
-        '{' + reduce([]) do |list, (k, v)|
-          list << "#{k.to_s}=>#{redact(k, v, __method__)}"
-        end.join(', ') + '}'
+        redacted_string(__method__)
       end
 
       # Whether these options contain a given key.
@@ -70,6 +66,12 @@ def has_key?(key)
 
       private
 
+      def redacted_string(method)
+        '{' + reduce([]) do |list, (k, v)|
+          list << "#{k.send(method)}=>#{redact(k, v, method)}"
+        end.join(', ') + '}'
+      end
+
       def redact(k, v, method)
         return STRING_REPLACEMENT if SENSITIVE_OPTIONS.include?(k.to_sym)
         v.send(method)