diff --git a/algorithms/001_sequential_migration/.project b/algorithms/001_sequential_migration/.project
deleted file mode 100644
index 8fdab3d..0000000
--- a/algorithms/001_sequential_migration/.project
+++ /dev/null
@@ -1,23 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<projectDescription>
-	<name>001_sequential_migration</name>
-	<comment>Project 001_sequential_migration created by Buildship.</comment>
-	<projects>
-	</projects>
-	<buildSpec>
-		<buildCommand>
-			<name>org.eclipse.jdt.core.javabuilder</name>
-			<arguments>
-			</arguments>
-		</buildCommand>
-		<buildCommand>
-			<name>org.eclipse.buildship.core.gradleprojectbuilder</name>
-			<arguments>
-			</arguments>
-		</buildCommand>
-	</buildSpec>
-	<natures>
-		<nature>org.eclipse.jdt.core.javanature</nature>
-		<nature>org.eclipse.buildship.core.gradleprojectnature</nature>
-	</natures>
-</projectDescription>
diff --git a/algorithms/001_sequential_migration/.classpath b/algorithms/sequential_migration/.classpath
similarity index 100%
rename from algorithms/001_sequential_migration/.classpath
rename to algorithms/sequential_migration/.classpath
diff --git a/algorithms/001_sequential_migration/.gitignore b/algorithms/sequential_migration/.gitignore
similarity index 100%
rename from algorithms/001_sequential_migration/.gitignore
rename to algorithms/sequential_migration/.gitignore
diff --git a/001_sequential_migration/.project b/algorithms/sequential_migration/.project
similarity index 100%
rename from 001_sequential_migration/.project
rename to algorithms/sequential_migration/.project
diff --git a/algorithms/001_sequential_migration/README.md b/algorithms/sequential_migration/README.md
similarity index 100%
rename from algorithms/001_sequential_migration/README.md
rename to algorithms/sequential_migration/README.md
diff --git a/algorithms/001_sequential_migration/build.gradle b/algorithms/sequential_migration/build.gradle
similarity index 100%
rename from algorithms/001_sequential_migration/build.gradle
rename to algorithms/sequential_migration/build.gradle
diff --git a/algorithms/001_sequential_migration/settings.gradle b/algorithms/sequential_migration/settings.gradle
similarity index 100%
rename from algorithms/001_sequential_migration/settings.gradle
rename to algorithms/sequential_migration/settings.gradle
diff --git a/algorithms/001_sequential_migration/src/main/java/Main.java b/algorithms/sequential_migration/src/main/java/Main.java
similarity index 100%
rename from algorithms/001_sequential_migration/src/main/java/Main.java
rename to algorithms/sequential_migration/src/main/java/Main.java
diff --git a/classlevel/lambdaexpressions/01_temp/.classpath b/classlevel/lambdaexpressions/01_temp/.classpath
new file mode 100644
index 0000000..4857be4
--- /dev/null
+++ b/classlevel/lambdaexpressions/01_temp/.classpath
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" output="bin/main" path="src/main/java">
+		<attributes>
+			<attribute name="gradle_scope" value="main"/>
+			<attribute name="gradle_used_by_scope" value="main,test"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8/"/>
+	<classpathentry kind="con" path="org.eclipse.buildship.core.gradleclasspathcontainer"/>
+	<classpathentry kind="output" path="bin/default"/>
+</classpath>
diff --git a/classlevel/lambdaexpressions/01_temp/.gradle/5.4/executionHistory/executionHistory.lock b/classlevel/lambdaexpressions/01_temp/.gradle/5.4/executionHistory/executionHistory.lock
new file mode 100644
index 0000000..d24c4b8
Binary files /dev/null and b/classlevel/lambdaexpressions/01_temp/.gradle/5.4/executionHistory/executionHistory.lock differ
diff --git a/classlevel/lambdaexpressions/01_temp/.gradle/5.4/fileChanges/last-build.bin b/classlevel/lambdaexpressions/01_temp/.gradle/5.4/fileChanges/last-build.bin
new file mode 100644
index 0000000..f76dd23
Binary files /dev/null and b/classlevel/lambdaexpressions/01_temp/.gradle/5.4/fileChanges/last-build.bin differ
diff --git a/classlevel/lambdaexpressions/01_temp/.gradle/5.4/fileHashes/fileHashes.lock b/classlevel/lambdaexpressions/01_temp/.gradle/5.4/fileHashes/fileHashes.lock
new file mode 100644
index 0000000..8eb5dfa
Binary files /dev/null and b/classlevel/lambdaexpressions/01_temp/.gradle/5.4/fileHashes/fileHashes.lock differ
diff --git a/classlevel/lambdaexpressions/01_temp/.gradle/5.4/gc.properties b/classlevel/lambdaexpressions/01_temp/.gradle/5.4/gc.properties
new file mode 100644
index 0000000..e69de29
diff --git a/classlevel/lambdaexpressions/01_temp/.gradle/buildOutputCleanup/buildOutputCleanup.lock b/classlevel/lambdaexpressions/01_temp/.gradle/buildOutputCleanup/buildOutputCleanup.lock
new file mode 100644
index 0000000..4ba3997
Binary files /dev/null and b/classlevel/lambdaexpressions/01_temp/.gradle/buildOutputCleanup/buildOutputCleanup.lock differ
diff --git a/classlevel/lambdaexpressions/01_temp/.gradle/buildOutputCleanup/cache.properties b/classlevel/lambdaexpressions/01_temp/.gradle/buildOutputCleanup/cache.properties
new file mode 100644
index 0000000..a558775
--- /dev/null
+++ b/classlevel/lambdaexpressions/01_temp/.gradle/buildOutputCleanup/cache.properties
@@ -0,0 +1,2 @@
+#Wed Jul 10 22:01:59 CEST 2019
+gradle.version=5.4
diff --git a/classlevel/lambdaexpressions/01_temp/.gradle/vcs-1/gc.properties b/classlevel/lambdaexpressions/01_temp/.gradle/vcs-1/gc.properties
new file mode 100644
index 0000000..e69de29
diff --git a/001_sequential_migration/bin/.project b/classlevel/lambdaexpressions/01_temp/.project
similarity index 81%
rename from 001_sequential_migration/bin/.project
rename to classlevel/lambdaexpressions/01_temp/.project
index 8fdab3d..db9c74f 100644
--- a/001_sequential_migration/bin/.project
+++ b/classlevel/lambdaexpressions/01_temp/.project
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <projectDescription>
-	<name>001_sequential_migration</name>
-	<comment>Project 001_sequential_migration created by Buildship.</comment>
+	<name>01_temp</name>
+	<comment>Project 01_temp created by Buildship.</comment>
 	<projects>
 	</projects>
 	<buildSpec>
diff --git a/classlevel/lambdaexpressions/01_temp/.settings/org.eclipse.buildship.core.prefs b/classlevel/lambdaexpressions/01_temp/.settings/org.eclipse.buildship.core.prefs
new file mode 100644
index 0000000..31e003a
--- /dev/null
+++ b/classlevel/lambdaexpressions/01_temp/.settings/org.eclipse.buildship.core.prefs
@@ -0,0 +1,13 @@
+arguments=
+auto.sync=false
+build.scans.enabled=false
+connection.gradle.distribution=GRADLE_DISTRIBUTION(LOCAL_INSTALLATION(c\:\\Gradle))
+connection.project.dir=
+eclipse.preferences.version=1
+gradle.user.home=c\:/Gradle
+java.home=
+jvm.arguments=
+offline.mode=false
+override.workspace.settings=true
+show.console.view=true
+show.executions.view=true
diff --git a/classlevel/lambdaexpressions/01_temp/bin/.settings/org.eclipse.buildship.core.prefs b/classlevel/lambdaexpressions/01_temp/bin/.settings/org.eclipse.buildship.core.prefs
new file mode 100644
index 0000000..31e003a
--- /dev/null
+++ b/classlevel/lambdaexpressions/01_temp/bin/.settings/org.eclipse.buildship.core.prefs
@@ -0,0 +1,13 @@
+arguments=
+auto.sync=false
+build.scans.enabled=false
+connection.gradle.distribution=GRADLE_DISTRIBUTION(LOCAL_INSTALLATION(c\:\\Gradle))
+connection.project.dir=
+eclipse.preferences.version=1
+gradle.user.home=c\:/Gradle
+java.home=
+jvm.arguments=
+offline.mode=false
+override.workspace.settings=true
+show.console.view=true
+show.executions.view=true
diff --git a/classlevel/lambdaexpressions/01_temp/bin/main/Main.class b/classlevel/lambdaexpressions/01_temp/bin/main/Main.class
new file mode 100644
index 0000000..e64cd60
Binary files /dev/null and b/classlevel/lambdaexpressions/01_temp/bin/main/Main.class differ
diff --git a/javabasics/lambdaexpressions/01_temp/build.gradle b/classlevel/lambdaexpressions/01_temp/build.gradle
similarity index 100%
rename from javabasics/lambdaexpressions/01_temp/build.gradle
rename to classlevel/lambdaexpressions/01_temp/build.gradle
diff --git a/javabasics/lambdaexpressions/01_temp/src/main/java/Main.java b/classlevel/lambdaexpressions/01_temp/src/main/java/Main.java
similarity index 100%
rename from javabasics/lambdaexpressions/01_temp/src/main/java/Main.java
rename to classlevel/lambdaexpressions/01_temp/src/main/java/Main.java
diff --git a/datetime/DT_01_currentdate/build.gradle b/datetime/DT_01_currentdate/build.gradle
index e4014a5..6f48294 100644
--- a/datetime/DT_01_currentdate/build.gradle
+++ b/datetime/DT_01_currentdate/build.gradle
@@ -8,7 +8,7 @@
 
 plugins {
     // Apply the java-library plugin to add support for Java Library
-    id 'java-library'
+    id 'java-application'
 }
 
 repositories {
diff --git a/notes/conferences/javauserforum.md b/readingcorner/conferences/javauserforum.md
similarity index 100%
rename from notes/conferences/javauserforum.md
rename to readingcorner/conferences/javauserforum.md