diff --git a/.gitignore b/.gitignore
index 9b364ff..5252c09 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,4 @@
 **.iml
 **build
 **.gradle/
+**.DS_Store
diff --git a/simple-algorithms/collection-sum/build.gradle b/simple-algorithms/collection-sum/build.gradle
index 968b5f0..9f5b988 100644
--- a/simple-algorithms/collection-sum/build.gradle
+++ b/simple-algorithms/collection-sum/build.gradle
@@ -2,9 +2,9 @@ plugins {
     id 'java'
 }
 
-def junitJupiterVersion = '5.7.0'
+def junitJupiterVersion = '5.10.2'
 
-group 'com.jos.dem.kata'
+group 'com.josdem.kata'
 version '1.0-SNAPSHOT'
 
 repositories {
diff --git a/simple-algorithms/collection-sum/gradle/wrapper/gradle-wrapper.properties b/simple-algorithms/collection-sum/gradle/wrapper/gradle-wrapper.properties
index 69a9715..a595206 100644
--- a/simple-algorithms/collection-sum/gradle/wrapper/gradle-wrapper.properties
+++ b/simple-algorithms/collection-sum/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.5-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/simple-algorithms/collection-sum/gradlew b/simple-algorithms/collection-sum/gradlew
old mode 100644
new mode 100755
diff --git a/simple-algorithms/collection-sum/gradlew.bat b/simple-algorithms/collection-sum/gradlew.bat
old mode 100644
new mode 100755
diff --git a/simple-algorithms/collection-sum/src/main/java/com/jos/dem/kata/CollectionAdder.java b/simple-algorithms/collection-sum/src/main/java/com/jos/dem/kata/CollectionAdder.java
deleted file mode 100644
index a2c4bf3..0000000
--- a/simple-algorithms/collection-sum/src/main/java/com/jos/dem/kata/CollectionAdder.java
+++ /dev/null
@@ -1,14 +0,0 @@
-package com.jos.dem.kata;
-
-/*
-Given an integer collection return a sum of its elements
- */
-
-import java.util.List;
-
-public class CollectionAdder {
-
-    public int sum(List<Integer> numbers) {
-        return numbers.stream().reduce(0, Integer::sum);
-    }
-}
diff --git a/simple-algorithms/collection-sum/src/main/java/com/josdem/kata/CollectionAdder.java b/simple-algorithms/collection-sum/src/main/java/com/josdem/kata/CollectionAdder.java
new file mode 100644
index 0000000..d7c6ccd
--- /dev/null
+++ b/simple-algorithms/collection-sum/src/main/java/com/josdem/kata/CollectionAdder.java
@@ -0,0 +1,10 @@
+package com.josdem.kata;
+
+import java.util.List;
+
+public class CollectionAdder {
+
+    public int sum(List<Integer> numbers) {
+        return numbers.size();
+    }
+}
diff --git a/simple-algorithms/collection-sum/src/test/java/com/jos/dem/kata/CollectionAdderTest.java b/simple-algorithms/collection-sum/src/test/java/com/josdem/kata/CollectionAdderTest.java
similarity index 73%
rename from simple-algorithms/collection-sum/src/test/java/com/jos/dem/kata/CollectionAdderTest.java
rename to simple-algorithms/collection-sum/src/test/java/com/josdem/kata/CollectionAdderTest.java
index 642e885..7af9b8c 100644
--- a/simple-algorithms/collection-sum/src/test/java/com/jos/dem/kata/CollectionAdderTest.java
+++ b/simple-algorithms/collection-sum/src/test/java/com/josdem/kata/CollectionAdderTest.java
@@ -1,4 +1,4 @@
-package com.jos.dem.kata;
+package com.josdem.kata;
 
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
@@ -7,9 +7,13 @@
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
+/*
+  Given an integer collection return a sum of its elements
+*/
+
 class CollectionAdderTest {
 
-    private CollectionAdder collectionAdder = new CollectionAdder();
+    private final CollectionAdder collectionAdder = new CollectionAdder();
 
     @Test
     @DisplayName("Accumulating a collection")
diff --git a/simple-algorithms/count-bits/gradlew.bat b/simple-algorithms/count-bits/gradlew.bat
deleted file mode 100644
index ac1b06f..0000000
--- a/simple-algorithms/count-bits/gradlew.bat
+++ /dev/null
@@ -1,89 +0,0 @@
-@rem
-@rem Copyright 2015 the original author or authors.
-@rem
-@rem Licensed under the Apache License, Version 2.0 (the "License");
-@rem you may not use this file except in compliance with the License.
-@rem You may obtain a copy of the License at
-@rem
-@rem      https://www.apache.org/licenses/LICENSE-2.0
-@rem
-@rem Unless required by applicable law or agreed to in writing, software
-@rem distributed under the License is distributed on an "AS IS" BASIS,
-@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-@rem See the License for the specific language governing permissions and
-@rem limitations under the License.
-@rem
-
-@if "%DEBUG%" == "" @echo off
-@rem ##########################################################################
-@rem
-@rem  Gradle startup script for Windows
-@rem
-@rem ##########################################################################
-
-@rem Set local scope for the variables with windows NT shell
-if "%OS%"=="Windows_NT" setlocal
-
-set DIRNAME=%~dp0
-if "%DIRNAME%" == "" set DIRNAME=.
-set APP_BASE_NAME=%~n0
-set APP_HOME=%DIRNAME%
-
-@rem Resolve any "." and ".." in APP_HOME to make it shorter.
-for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
-
-@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
-
-@rem Find java.exe
-if defined JAVA_HOME goto findJavaFromJavaHome
-
-set JAVA_EXE=java.exe
-%JAVA_EXE% -version >NUL 2>&1
-if "%ERRORLEVEL%" == "0" goto execute
-
-echo.
-echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
-
-goto fail
-
-:findJavaFromJavaHome
-set JAVA_HOME=%JAVA_HOME:"=%
-set JAVA_EXE=%JAVA_HOME%/bin/java.exe
-
-if exist "%JAVA_EXE%" goto execute
-
-echo.
-echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
-
-goto fail
-
-:execute
-@rem Setup the command line
-
-set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
-
-
-@rem Execute Gradle
-"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
-
-:end
-@rem End local scope for the variables with windows NT shell
-if "%ERRORLEVEL%"=="0" goto mainEnd
-
-:fail
-rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
-rem the _cmd.exe /c_ return code!
-if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
-exit /b 1
-
-:mainEnd
-if "%OS%"=="Windows_NT" endlocal
-
-:omega
diff --git a/simple-algorithms/count-bits/settings.gradle b/simple-algorithms/count-bits/settings.gradle
deleted file mode 100644
index c7c5586..0000000
--- a/simple-algorithms/count-bits/settings.gradle
+++ /dev/null
@@ -1,2 +0,0 @@
-rootProject.name = 'count-bits'
-