Added comment

src/main/java/org/gcube/socialnetworking/socialtoken/SanitizedURL.java

@@ -44,6 +44,12 @@ public class SanitizedURL {
 		if(testPostFix.matches(CHARACTERS_TO_REMOVE)) {
 			postfix = urlString.substring(urlString.length()-1) + postfix;
 			urlString = urlString.substring(0, urlString.length()-1);
+			
+			/*
+			 * The urlString could terminate with more than one character to be escaped
+			 * So we need to further analyse the sanitised URL
+			 * e.g. 'https://data.d4science.net/tfXA),' terminates with '),'
+			 */
 			urlString = stripPostfix(urlString);
 		}
 		return urlString;