Avoid unnecessary converions

codeblock.go

@@ -44,7 +44,7 @@ func (e *CodeBlockElement) Render(w io.Writer, ctx RenderContext) error {
 
 	// fallback rendering
 	el := &BaseElement{
-		Token: string(e.Code),
+		Token: e.Code,
 		Style: rules,
 	}
 

heading.go

@@ -58,7 +58,7 @@ func (e *HeadingElement) Render(w io.Writer, ctx RenderContext) error {
 	}
 	el := &BaseElement{
 		Prefix: pre,
-		Token:  string(e.Text),
+		Token:  e.Text,
 		Style:  rules,
 	}
 	err := el.Render(flow, ctx)

image.go

@@ -24,7 +24,7 @@ func (e *ImageElement) Render(w io.Writer, ctx RenderContext) error {
 	}
 	if len(e.URL) > 0 {
 		el := &BaseElement{
-			Token:  resolveRelativeURL(e.BaseURL, string(e.URL)),
+			Token:  resolveRelativeURL(e.BaseURL, e.URL),
 			Prefix: " ",
 			Style:  ctx.style[Image],
 		}