Do not create a tmp string object
Do not create a tmp string object

This reduces memory usage by 3.5%:
  https://gist.github.com/yuki24/21f40d10bdae7c2a3e91/1c2b6a0b7d20ac29298e8efb9c711a998a20bbe6

Ye-Yong-Chi/did_you_mean,yuki24/did_you_mean,yui-knk/did_you_mean