[Sass]Adding a 0 if only one digit serial number of the class name

_Addingzero.scss

$num: "";
@for $i from 1 through 10 {
	@if $i < 10 {
		$num: "0#{$i}";
	} @else {
		$num: "#{$i}";
	}
	.classname#{$num} {
		// CSS code here
	}	
}

//.classname01{}
//.classname02{}
//.classname03{}
//.classname04{}
//.classname05{}
//.classname06{}
//.classname07{}
//.classname08{}
//.classname09{}
//.classname10{}