fix: rubocop

Author: stefan-wtfoxtrot

lib/chewy/index/witchcraft.rb

@@ -172,12 +172,7 @@ def proc_fields_for(parent, nesting)
         end
 
         def source_for(proc, nesting)
-          ast = if defined?(Prism)
-            Prism::Translation::ParserCurrent.parse(proc.source)
-          else
-            Parser::CurrentRuby.parse(proc.source)
-          end
-          lambdas = exctract_lambdas(ast)
+          lambdas = exctract_lambdas(ast_from_proc(proc))
 
           raise "No lambdas found, try to reformat your code:\n`#{proc.source}`" unless lambdas
 
@@ -204,6 +199,14 @@ def source_for(proc, nesting)
           Unparser.unparse(source)
         end
 
+        def ast_from_proc(proc)
+          if defined?(Prism)
+            Prism::Translation::ParserCurrent.parse(proc.source)
+          else
+            Parser::CurrentRuby.parse(proc.source)
+          end
+        end
+
         def exctract_lambdas(node)
           return unless node.is_a?(Parser::AST::Node)