[SYSTEMDS-3938] Fix einsum codestyle and code quality #3

	#-------------------------------------------------------------
	#
	# Licensed to the Apache Software Foundation (ASF) under one
	# or more contributor license agreements. See the NOTICE file
	# distributed with this work for additional information
	# regarding copyright ownership. The ASF licenses this file
	# to you under the Apache License, Version 2.0 (the
	# "License"); you may not use this file except in compliance
	# with the License. You may obtain a copy of the License at
	#
	# http://www.apache.org/licenses/LICENSE-2.0
	#
	# Unless required by applicable law or agreed to in writing,
	# software distributed under the License is distributed on an
	# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
	# KIND, either express or implied. See the License for the
	# specific language governing permissions and limitations
	# under the License.
	#
	#-------------------------------------------------------------

	name: Java Codestyle

	on:
	push:
	paths-ignore:
	- 'docs/**'
	- '*.md'
	- '*.html'
	- 'src/main/python/**'
	- 'dev/**'
	branches:
	- main
	pull_request:
	paths-ignore:
	- 'docs/**'
	- '*.md'
	- '*.html'
	- 'src/main/python/**'
	- 'dev/**'
	branches:
	- main

	jobs:
	java_codestyle:
	name: Java Checkstyle
	runs-on: ubuntu-latest
	steps:
	- name: Checkout Repository
	uses: actions/checkout@v6

	- name: Setup Java 17 adopt
	uses: actions/setup-java@v5
	with:
	distribution: adopt
	java-version: '17'
	cache: 'maven'

	- name: Run Checkstyle
	run: mvn -ntp -B -Dcheckstyle.skip=false checkstyle:check

Provide feedback