function toNoCase (string) {
  if (hasSpace.test(string)) return string.toLowerCase();
  if (hasSeparator.test(string)) return unseparate(string).toLowerCase();
  return uncamelize(string).toLowerCase();
}
Remove any starting case from a `string`, like camel or snake, but keep
spaces and punctuation that may be important otherwise.

@param {String} string
@return {String}