Address RuboCop offenses

```ruby
$ bundle exec rubocop -a
Inspecting 73 files
...................W.......C..............CC.............................

Offenses:

lib/active_record/connection_adapters/oracle_enhanced/quoting.rb:49:13: C: [Corrected] Layout/IndentationWidth: Use 2 (not 32) spaces for indentation.
                                            "\"#{name.upcase}\""
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
lib/active_record/connection_adapters/oracle_enhanced/quoting.rb:50:43: C: [Corrected] Layout/ElseAlignment: Align else with QUOTED_COLUMN_NAMES[name].
                                          else
                                          ^^^^
lib/active_record/connection_adapters/oracle_enhanced/quoting.rb:51:45: C: [Corrected] Layout/CommentIndentation: Incorrect indentation detected (column 44 instead of 14).
                                            # remove double quotes which cannot be used inside quoted identifier
                                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
lib/active_record/connection_adapters/oracle_enhanced/quoting.rb:52:13: C: [Corrected] Layout/IndentationWidth: Use 2 (not 32) spaces for indentation.
                                            "\"#{name.delete('"')}\""
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
lib/active_record/connection_adapters/oracle_enhanced/quoting.rb:53:43: W: [Corrected] Layout/EndAlignment: end at 53, 42 is not aligned with QUOTED_COLUMN_NAMES[name] ||= if at 48, 12.
                                          end
                                          ^^^
lib/active_record/connection_adapters/oracle_enhanced/quoting.rb:60:1: C: [Corrected] Layout/EmptyLinesAroundModuleBody: Extra empty line detected at module body end.
lib/active_record/connection_adapters/oracle_enhanced/quoting.rb:110:1: C: [Corrected] Layout/EmptyLines: Extra blank line detected.
lib/active_record/connection_adapters/oracle_enhanced_adapter.rb:66:1: C: [Corrected] Layout/EmptyLinesAroundModuleBody: Extra empty line detected at module body beginning.
lib/arel/visitors/oracle_common.rb:6:1: C: [Corrected] Layout/EmptyLinesAroundModuleBody: Extra empty line detected at module body beginning.
spec/active_record/connection_adapters/emulation/oracle_adapter_spec.rb:13:86: C: [Corrected] Style/StringLiterals: Prefer double-quoted strings unless you need single quotes to avoid extra backslashes for escaping.
    @conn = ActiveRecord::Base.establish_connection(CONNECTION_PARAMS.merge(adapter: 'oracle'))
                                                                                     ^^^^^^^^

73 files inspected, 10 offenses detected, 10 offenses corrected
$
```

Author: yahonda

lib/active_record/connection_adapters/oracle_enhanced/quoting.rb

@@ -46,18 +46,17 @@ def column_name_with_order_matcher
           def quote_column_name(name) # :nodoc:
             name = name.to_s
             QUOTED_COLUMN_NAMES[name] ||= if /\A[a-z][a-z_0-9$#]*\Z/.match?(name)
-                                            "\"#{name.upcase}\""
-                                          else
-                                            # remove double quotes which cannot be used inside quoted identifier
-                                            "\"#{name.delete('"')}\""
-                                          end
+              "\"#{name.upcase}\""
+            else
+              # remove double quotes which cannot be used inside quoted identifier
+              "\"#{name.delete('"')}\""
+            end
           end
 
           def quote_table_name(name) # :nodoc:
             name, _link = name.to_s.split("@")
             QUOTED_TABLE_NAMES[name] ||= [name.split(".").map { |n| quote_column_name(n) }].join(".")
           end
-
         end
 
         # This method is used in add_index to identify either column name (which is quoted)
@@ -107,7 +106,6 @@ def self.mixed_case?(name)
           !!(object_name =~ /[A-Z]/ && object_name =~ /[a-z]/)
         end
 
-
         def quote_string(s) # :nodoc:
           s.gsub(/'/, "''")
         end

lib/active_record/connection_adapters/oracle_enhanced_adapter.rb

@@ -63,7 +63,6 @@
 require "active_record/type/oracle_enhanced/character_string"
 
 module ActiveRecord
-
   module ConnectionAdapters # :nodoc:
     # Oracle enhanced adapter will work with both
     # CRuby ruby-oci8 gem (which provides interface to Oracle OCI client)

lib/arel/visitors/oracle_common.rb

@@ -3,7 +3,6 @@
 module Arel # :nodoc: all
   module Visitors
     module OracleCommon
-
       BIND_BLOCK = proc { |i| ":a#{i}" }
       private_constant :BIND_BLOCK
 

spec/active_record/connection_adapters/emulation/oracle_adapter_spec.rb

@@ -10,7 +10,7 @@
   end
 
   it "should be an OracleAdapter" do
-    @conn = ActiveRecord::Base.establish_connection(CONNECTION_PARAMS.merge(adapter: 'oracle'))
+    @conn = ActiveRecord::Base.establish_connection(CONNECTION_PARAMS.merge(adapter: "oracle"))
     expect(ActiveRecord::Base.connection).not_to be_nil
     expect(ActiveRecord::Base.connection.is_a?(ActiveRecord::ConnectionAdapters::OracleAdapter)).to be_truthy
   end