Fixed typo and string builder

Author: muarachmann

src/DataTypes/Calendar.php

@@ -103,16 +103,16 @@ protected function buildCalendarString()
             $calendar .= "SUMMARY:".$this->summary.$this->separator;
         }
         if (isset($this->location)) {
-            $calendar .= 'LOCATION:'.$this->location.$this->separator;
+            $calendar .= "LOCATION:".$this->location.$this->separator;
         }
         if (isset($this->url)) {
-            $calendar .= 'URL:'.$this->url.$this->separator;
+            $calendar .= "URL:".$this->url.$this->separator;
         }
         if (isset($this->startDateTime)) {
-            $calendar .= 'DTSTART:'.$this->convertEventDateTimeToString($this->startDateTime).$this->separator;
+            $calendar .= "DTSTART:".$this->convertEventDateTimeToString($this->startDateTime).$this->separator;
         }
         if (isset($this->endDateTime)) {
-            $calendar .= 'DTEND:'.$this->convertEventDateTimeToString($this->endDateTime).$this->separator;
+            $calendar .= "DTEND:".$this->convertEventDateTimeToString($this->endDateTime).$this->separator;
         }
 
         $calendar .= $this->suffix;
@@ -141,7 +141,7 @@ protected function setProperties(array $arguments)
             $this->setEventDateTime($arguments['start_date_time'], "start");
         }
         if (isset($arguments['end_date_time'])) {
-            $this->setEventDateTime($arguments['start_date_time'], "end");
+            $this->setEventDateTime($arguments['end_date_time'], "end");
         }
     }