Example shortcode function

shortcode1.php

add_shortcode('yolo', 'gearside_yolo_shortcode');
function gearside_yolo_shortcode(){
	//Code will go here...
}

shortcode2.php

add_shortcode('yolo', 'gearside_yolo_shortcode');
function gearside_yolo_shortcode($atts, $content=''){
	extract(shortcode_atts(array('class' => '', 'style' => ''), $atts));
	//More code will be here...
}

shortcode3.php

add_shortcode('yolo', 'gearside_yolo_shortcode');
function gearside_yolo_shortcode($atts, $content=''){
	extract( shortcode_atts(array('class' => '', 'style' => ''), $atts) );
	return '<div class="gearside-yolo-shortcode ' . $class . '" style="background: blue; color: white; ' . $style . '" >' . $content . '</div>';
}