added getCommaListString method

util/src/main/java/de/muehlencord/shared/util/StringUtil.java

@@ -144,4 +144,19 @@ public abstract class StringUtil {
             return null;
         }
     }
+
+    public static <T> String getCommaListString(Class<T> clazz, T[] typeArray, String methodName) throws NoSuchMethodException, IllegalAccessException, IllegalArgumentException, InvocationTargetException {
+        String returnValue = "";
+        Method method = clazz.getMethod(methodName);
+
+        for (T currentProject : typeArray) {
+            @SuppressWarnings("unchecked")
+            String value = (String) method.invoke(currentProject) + ",";
+            returnValue += value;
+        }
+        if (returnValue.endsWith(",")) {
+            returnValue = returnValue.substring(0, returnValue.length() - 1);
+        }
+        return returnValue;
+    }
 }