fix(style): properly tokenize in RedundantBegin rule

spec/ameba/rule/style/redundant_begin_spec.cr

@@ -241,6 +241,27 @@ module Ameba::Rule::Style
         CRYSTAL
     end
 
+    it "fails if there is a redundant block with string with inner quotes" do
+      source = expect_issue subject, <<-CRYSTAL
+        def method
+          begin
+        # ^^^^^ error: Redundant `begin` block detected
+            "'"
+          rescue
+          end
+        end
+        CRYSTAL
+
+      expect_correction source, <<-CRYSTAL
+        def method
+         #{trailing_whitespace}
+            "'"
+          rescue
+         #{trailing_whitespace}
+        end
+        CRYSTAL
+    end
+
     it "fails if there is top level redundant block in a method" do
       source = expect_issue subject, <<-CRYSTAL
         def method

src/ameba/rule/style/redundant_begin.cr

@@ -142,7 +142,7 @@ module Ameba::Rule::Style
     private def def_redundant_end_loc(lexer)
       end_loc = def_end_loc = nil
 
-      while !(token = lexer.next_token).type.eof?
+      Tokenizer.new(lexer).run do |token|
         next unless token.value == Crystal::Keyword::END
 
         end_loc, def_end_loc = def_end_loc, token.location