I changed three things from MessageFormatter class.

First, declare field variables in for-loop.
Before I change, field variables named "j", "l" declared outside the for-loop. I thought that it was because of the performance. but from performance perspective, It was not faster than declaring in for-loop (rather, the latter was faster). So, I changed these based on a maintenance perspective. "declare where use."

Second, There was wrong spelled method in messageFormatter (isEscapedDelimeter -> isEscapedDelimiter). It is only used in same class. So I changed.

Last, static char `DELIM_STOP` never used in messageFormatter class. so I deleted.

this is my first time to contribute!