KTLN-507 source code (#871)

* KTLN-507 source code

* KTLN-507 Core review fixes

Author: mipo256

core-kotlin-modules/core-kotlin-10/src/main/java/com/baeldung/StringWrapper.java

@@ -0,0 +1,21 @@
+package com.baeldung;
+
+public class StringWrapper {
+  private final String source;
+
+  public StringWrapper(String source) {
+    this.source = source;
+  }
+
+  public boolean containsIgnoreCase(String other) {
+    if (source == null) {
+      return false;
+    }
+
+    return source.toLowerCase().contains(other.toLowerCase());
+  }
+
+  public String getSource() {
+    return source;
+  }
+}

core-kotlin-modules/core-kotlin-10/src/main/kotlin/com/baeldung/access_private_members_from_extension_func/Main.kt

@@ -0,0 +1,18 @@
+package com.baeldung.access_private_members_from_extension_func
+
+class Main {
+  fun String?.containsIgnoreCase(target: String) : Boolean {
+    if (this == null) {
+      return false
+    }
+
+    val loadedClass = String::class
+    val valueField = loadedClass.java.getDeclaredField("value")
+    valueField?.isAccessible = true
+    val actualValue = valueField?.get(this) as? ByteArray
+
+    println(actualValue?.contentToString())
+
+    return this.lowercase().contains(target.lowercase())
+  }
+}