// Gets substring from string
// -------------------------------------------------------------------------------
// @dependence `string-to-list()`
// -------------------------------------------------------------------------------
// @param $full-string [String] : string that contains substring
// @param $depth [Integer | "last | "first"] : depth of substring
// -------------------------------------------------------------------------------
// @return [String]

@function get-substring($full-string, $depth) {
	@if is-string($full-string) {
		$get-substring: string-to-list($full-string);

		@if $depth == "last" {
			@return nth($get-substring, length($get-substring));
		} @else if $depth == "first" {
			@return nth($get-substring, 1);
		} @else {
			@return nth($get-substring, $depth);
		}
	} @else {
		@return "You did not input a valid string: #{$full-string}";
	}
}