Prefer `Kernel#format` to `String#%`

This commit fixes cases that cannot be detected by RuboCop

Ref: https://www.rubydoc.info/gems/rubocop/RuboCop/Cop/Style/FormatString

3 files changed, 4 insertions, 4 deletions

diff --git a/lib/axlsx/drawing/chart.rb b/lib/axlsx/drawing/chart.rb
index 6b3acab1..63a12641 100644
--- a/lib/axlsx/drawing/chart.rb
+++ b/lib/axlsx/drawing/chart.rb
@@ -124,7 +124,7 @@ module Axlsx
     # The part name for this chart
     # @return [String]
     def pn
-      CHART_PN % (index + 1)
+      format(CHART_PN, index + 1)
     end
 
     # The title object for the chart.
diff --git a/lib/axlsx/drawing/drawing.rb b/lib/axlsx/drawing/drawing.rb
index 8ae4ed0c..c927a6c9 100644
--- a/lib/axlsx/drawing/drawing.rb
+++ b/lib/axlsx/drawing/drawing.rb
@@ -128,14 +128,14 @@ module Axlsx
     # The part name for this drawing
     # @return [String]
     def pn
-      DRAWING_PN % (index + 1)
+      format(DRAWING_PN, index + 1)
     end
 
     # The relational part name for this drawing
     # #NOTE This should be rewritten to return an Axlsx::Relationship object.
     # @return [String]
     def rels_pn
-      DRAWING_RELS_PN % (index + 1)
+      format(DRAWING_RELS_PN, index + 1)
     end
 
     # A list of objects this drawing holds.
diff --git a/lib/axlsx/drawing/vml_drawing.rb b/lib/axlsx/drawing/vml_drawing.rb
index 15698486..9132b00c 100644
--- a/lib/axlsx/drawing/vml_drawing.rb
+++ b/lib/axlsx/drawing/vml_drawing.rb
@@ -14,7 +14,7 @@ module Axlsx
     # The part name for this vml drawing
     # @return [String]
     def pn
-      VML_DRAWING_PN % (@comments.worksheet.index + 1)
+      format(VML_DRAWING_PN, @comments.worksheet.index + 1)
     end
 
     # serialize the vml_drawing to xml.