diff --git a/base/src/main/kotlin/de/staropensource/engine/base/implementable/formatter/TwoCycleFormatterImpl.kt b/base/src/main/kotlin/de/staropensource/engine/base/implementable/formatter/TwoCycleFormatterImpl.kt
index b7213de08..34055ecbc 100644
--- a/base/src/main/kotlin/de/staropensource/engine/base/implementable/formatter/TwoCycleFormatterImpl.kt
+++ b/base/src/main/kotlin/de/staropensource/engine/base/implementable/formatter/TwoCycleFormatterImpl.kt
@@ -39,7 +39,7 @@ import kotlin.text.iterator
  * - `ATTRIBUTE:` (example `ATTRIBUTE:BOLD`)
  *
  * @see TwoCycleFormatter
- * @see de.staropensource.engine.logging.implementable.Formatter
+ * @see Formatter
  * @since v1-alpha10
  */
 abstract class TwoCycleFormatterImpl: TwoCycleFormatter() {
diff --git a/base/src/main/kotlin/de/staropensource/engine/base/implementation/logging/NoOperationFormatter.kt b/base/src/main/kotlin/de/staropensource/engine/base/implementation/logging/NoOperationFormatter.kt
index a5bbc7c2b..f845e839e 100644
--- a/base/src/main/kotlin/de/staropensource/engine/base/implementation/logging/NoOperationFormatter.kt
+++ b/base/src/main/kotlin/de/staropensource/engine/base/implementation/logging/NoOperationFormatter.kt
@@ -49,9 +49,9 @@ class NoOperationFormatter private constructor(): OneCycleFormatter() {
     @Suppress("NestedBlockDepth")
     override fun parseAndFormat(message: String): String {
         val output: StringBuilder = StringBuilder()
+        var currentComponent: StringBuilder = StringBuilder()
         var escaped: Boolean = false
         var inTag: Boolean = false
-        var currentComponent: StringBuilder = StringBuilder()
 
         // This iteration loop should
         // be readable enough to not
diff --git a/base/src/main/kotlin/de/staropensource/engine/base/implementation/logging/formatbuilder/SOSLSv2FormatBuilder.kt b/base/src/main/kotlin/de/staropensource/engine/base/implementation/logging/formatbuilder/SOSLSv2FormatBuilder.kt
index c1c8a3ea6..19145ed7d 100644
--- a/base/src/main/kotlin/de/staropensource/engine/base/implementation/logging/formatbuilder/SOSLSv2FormatBuilder.kt
+++ b/base/src/main/kotlin/de/staropensource/engine/base/implementation/logging/formatbuilder/SOSLSv2FormatBuilder.kt
@@ -58,27 +58,23 @@ open class SOSLSv2FormatBuilder(call: Call) : FormatBuilder(call) {
      * @return finalized format
      * @since v1-alpha10
      */
-    fun format(message: Boolean): String {
-        val format: StringBuilder = StringBuilder()
-
-        addRuntime(format)
-        addDateTime(format)
+    fun format(message: Boolean): String = buildString {
+        addRuntime(this)
+        addDateTime(this)
 
         // Add level, origin & other metadata
         if (enabledFeatures.contains(Feature.LEVEL) || enabledFeatures.contains(Feature.ORIGIN)) {
-            format.append("[")
-            addLevel(format)
+            append("[")
+            addLevel(this)
             if (enabledFeatures.contains(Feature.LEVEL) && enabledFeatures.contains(Feature.ORIGIN))
-                format.append(" ")
-            addOriginAndMetadata(format)
-            format.append("] ")
+                append(" ")
+            addOriginAndMetadata(this)
+            append("] ")
         }
 
         // Message
         if (message)
-            format.append(this.message)
-
-        return format.toString()
+            append(this@SOSLSv2FormatBuilder.message)
     }
 
     /**
diff --git a/base/src/main/kotlin/de/staropensource/engine/base/logging/CrashHandler.kt b/base/src/main/kotlin/de/staropensource/engine/base/logging/CrashHandler.kt
index 7a1ef60d6..49d9d5f47 100644
--- a/base/src/main/kotlin/de/staropensource/engine/base/logging/CrashHandler.kt
+++ b/base/src/main/kotlin/de/staropensource/engine/base/logging/CrashHandler.kt
@@ -97,8 +97,7 @@ class CrashHandler private constructor() {
          * @return compiled output
          * @since v1-alpha10
          */
-        private fun compileCategory(map: LinkedHashMap<*, *>, indent: Int = 1): String {
-            val builder: StringBuilder = StringBuilder()
+        private fun compileCategory(map: LinkedHashMap<*, *>, indent: Int = 1): String = buildString {
             var entryString: String? = null
 
             // Iterate over all entries
@@ -107,12 +106,12 @@ class CrashHandler private constructor() {
                 if (entry !is String)
                     continue
 
-                builder.append("\n${" ".repeat(indent)}-> ${entry}")
+                append("\n${" ".repeat(indent)}-> ${entry}")
 
                 if (map[entry] == null)  // Value is null
                     true
                 else if (map[entry] is LinkedHashMap<*, *>)  // Value is a map
-                    builder.append(
+                    append(
                         compileCategory(
                             map[entry] as LinkedHashMap<*, *>,
                             indent = indent + 3  // increase the 2nd addend to change the indent size during recursion
@@ -123,19 +122,16 @@ class CrashHandler private constructor() {
 
                     // Put on separate line if contains newline
                     if (entryString.contains("\n"))
-                        builder
-                            .append("\n${entryString}"
-                                .replace(
-                                    "\n",
-                                    "\n   ${" ".repeat(indent)}"
-                                )
+                        append("\n${entryString}"
+                            .replace(
+                                "\n",
+                                "\n   ${" ".repeat(indent)}"
                             )
+                        )
                     else
-                        builder.append(": ${entryString}")
+                        append(": ${entryString}")
                 }
             }
-
-            return builder.toString()
         }
     }
 }
diff --git a/base/src/main/kotlin/de/staropensource/engine/base/utility/FileAccess.kt b/base/src/main/kotlin/de/staropensource/engine/base/utility/FileAccess.kt
index c6c7c8698..a1f444d77 100644
--- a/base/src/main/kotlin/de/staropensource/engine/base/utility/FileAccess.kt
+++ b/base/src/main/kotlin/de/staropensource/engine/base/utility/FileAccess.kt
@@ -448,20 +448,18 @@ class FileAccess {
         try {
             return PosixFilePermissions.toString(Files.getPosixFilePermissions(path))
         } catch (exception: UnsupportedOperationException) {
-            if (fakeOnUnsupported) {
-                val builder: StringBuilder = StringBuilder()
+            return if (fakeOnUnsupported) {
+                buildString {
+                    // Add permissions
+                    if (isReadable()) append("r")
+                    if (isWritable()) append("w")
+                    if (isExecutable()) append("x")
 
-                // Add permissions
-                if (isReadable()) builder.append("r")
-                if (isWritable()) builder.append("w")
-                if (isExecutable()) builder.append("x")
-
-                // Repeat two times to match the format
-                builder.repeat(2)
-
-                return builder.toString()
+                    // Repeat two times to match the format
+                    repeat(2)
+                }
             } else
-                return null
+                null
         } catch (exception: Exception) {
             throw IOAccessException(exception.message, exception.cause)
         }
diff --git a/testapp/src/main/kotlin/de/staropensource/engine/testapp/Main.kt b/testapp/src/main/kotlin/de/staropensource/engine/testapp/Main.kt
index bf2230584..eeede52b6 100644
--- a/testapp/src/main/kotlin/de/staropensource/engine/testapp/Main.kt
+++ b/testapp/src/main/kotlin/de/staropensource/engine/testapp/Main.kt
@@ -20,7 +20,9 @@
 package de.staropensource.engine.testapp
 
 import de.staropensource.engine.base.Engine
+import de.staropensource.engine.base.EngineConfiguration
 import de.staropensource.engine.base.logging.Logger
+import de.staropensource.engine.base.type.logging.Level
 
 /**
  * Testing program for the StarOpenSource Engine.