function createCompounder(callback) {
      return function(string) {
        var index = -1,
            array = words(deburr(string)),
            length = array.length,
            result = '';

        while (++index < length) {
          result = callback(result, array[index], index);
        }
        return result;
      };
    }
Creates a function that produces compound words out of the words in a
given string.

@private
@param {Function} callback The function invoked to combine each word.
@returns {Function} Returns the new compounder function.