def replace_string_node(target, value)
      quote = target.loc.begin.source
      rewriter.replace(target.loc.expression, "#{quote}#{value}#{quote}")
    end
def replace_string_node(target, value)
      quote = target.loc.begin.source
      rewriter.replace(target.loc.expression, "#{quote}#{value}#{quote}")
    end
Change content of string, keeping quoting style.