fix bug

src/functions.php

@@ -134,7 +134,7 @@ if (!function_exists('download')) {
      */
     function download($filePath = '', $showName = '')
     {
-        return $this->response->download($filePath, urlencode($showName));
+        return response()->download($filePath, urlencode($showName));
     }
 }
 
@@ -744,10 +744,10 @@ if (!function_exists('to_camel_case')) {
     {
         $array = explode($dirSep, $str);
         $result = $array[0];
-        $len=count($array);
-        if($len>1) {
-            for($i=1;$i<$len;$i++) {
-                $result.= ucfirst($array[$i]);
+        $len = count($array);
+        if ($len > 1) {
+            for ($i = 1; $i < $len; $i++) {
+                $result .= ucfirst($array[$i]);
             }
         }
         return $result;