cpi : groovy code: fetech required part in sender filename

ip

az_blob_file_name   header      value   example_filename_220101.csv 

o/p

az_blob_file_name1    PRE_KIEWIT_YOS_20220101.csv

import com.sap.gateway.ip.core.customdev.util.Message

import java.util.HashMap

import java.text.SimpleDateFormat

import java.util.Date

def Message processData(Message message) {

    def map = message.getHeaders()

    def sFileName = map.get("az_blob_file_name")

    def sFileYr = sFileName[-10..-5] // Extracting the date part from the filename

    print sFileYr;

    def sDate = Date.parse("yymmdd", sFileYr) // Parsing the date string

    def newFormat = new SimpleDateFormat("yyyymmdd") // Creating a new date format

    def finalString = newFormat.format(sDate) // Formatting the date string

    def newFileName = "PRE_KIEWIT_YOS_${finalString}.csv" // Constructing the new filename

    message.setHeader("az_blob_file_name1", newFileName)

    return message

}