function decimals( x, fcn ) {
	var out;
	var len;
	var i;

	len = x.length;
	out = '';
	for ( i = 0; i < len; i++ ) {
		out += fcn( x[ i ], '' );
		if ( i < len-1 ) {
			out += ' ';
		}
	}
	return out;
}
Processes a string of decimal numbers and applies a function mapping decimal numbers to words to each character.

@private
@param {string} x - string of decimal numbers
@param {Function} fcn - function mapping decimal numbers to words
@returns {string} string of words