diff --git a/core-java-modules/core-java-string-algorithms-4/README.md b/core-java-modules/core-java-string-algorithms-4/README.md
new file mode 100644
index 0000000000..0651448493
--- /dev/null
+++ b/core-java-modules/core-java-string-algorithms-4/README.md
@@ -0,0 +1,5 @@
+## Java String Algorithms
+
+This module contains articles about string-related algorithms.
+
+### Relevant Articles:
\ No newline at end of file
diff --git a/core-java-modules/core-java-string-algorithms-4/pom.xml b/core-java-modules/core-java-string-algorithms-4/pom.xml
new file mode 100644
index 0000000000..b374b48743
--- /dev/null
+++ b/core-java-modules/core-java-string-algorithms-4/pom.xml
@@ -0,0 +1,14 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>core-java-string-algorithms-4</artifactId>
+    <name>core-java-string-algorithms-4</name>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>com.baeldung.core-java-modules</groupId>
+        <artifactId>core-java-modules</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+    </parent>
+</project>
\ No newline at end of file
diff --git a/core-java-modules/core-java-string-algorithms-4/src/test/java/com/baeldung/string/shiftchar/ShiftCharInStringUnitTest.java b/core-java-modules/core-java-string-algorithms-4/src/test/java/com/baeldung/string/shiftchar/ShiftCharInStringUnitTest.java
new file mode 100644
index 0000000000..92bbc48c98
--- /dev/null
+++ b/core-java-modules/core-java-string-algorithms-4/src/test/java/com/baeldung/string/shiftchar/ShiftCharInStringUnitTest.java
@@ -0,0 +1,100 @@
+package com.baeldung.string.shiftchar;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.junit.jupiter.api.Test;
+
+public class ShiftCharInStringUnitTest {
+
+    private final static String STRING = "abcdefg";
+
+    private final static String EXPECT_1X = "gabcdef";
+    private final static String EXPECT_2X = "fgabcde";
+    private final static String EXPECT_3X = "efgabcd";
+    private final static String EXPECT_6X = "bcdefga";
+    private final static String EXPECT_7X = "abcdefg";
+    private final static String EXPECT_24X = "efgabcd";
+
+    private final static String B_EXPECT_1X = "bcdefga";
+    private final static String B_EXPECT_2X = "cdefgab";
+    private final static String B_EXPECT_3X = "defgabc";
+    private final static String B_EXPECT_6X = "gabcdef";
+    private final static String B_EXPECT_7X = "abcdefg";
+    private final static String B_EXPECT_24X = "defgabc";
+
+    static String rotateString1(String s, int c, boolean forward) {
+        if (c < 0) {
+            throw new IllegalArgumentException("Rotation character count cannot be negative!");
+        }
+        int len = s.length();
+        int n = c % len;
+        if (n == 0) {
+            return s;
+        }
+        n = forward ? n : len - n;
+        return s.substring(len - n, len) + s.substring(0, len - n);
+    }
+
+    static String rotateString2(String s, int c, boolean forward) {
+        if (c < 0) {
+            throw new IllegalArgumentException("Rotation character count cannot be negative!");
+        }
+        int len = s.length();
+        int n = c % len;
+        if (n == 0) {
+            return s;
+        }
+        String ss = s + s;
+        n = forward ? n : len - n;
+        return ss.substring(len - n, 2 * len - n);
+    }
+
+    static boolean rotatedFrom(String rotated, String rotateFrom) {
+        return rotateFrom.length() == rotated.length() && (rotateFrom + rotateFrom).contains(rotated);
+    }
+
+    @Test
+    void whenUsingRotateString1_thenGetExpectedResults() {
+        assertEquals(EXPECT_1X, rotateString1(STRING, 1, true));
+        assertEquals(EXPECT_2X, rotateString1(STRING, 2, true));
+        assertEquals(EXPECT_3X, rotateString1(STRING, 3, true));
+        assertEquals(EXPECT_6X, rotateString1(STRING, 6, true));
+        assertEquals(EXPECT_7X, rotateString1(STRING, 7, true));
+        assertEquals(EXPECT_24X, rotateString1(STRING, 24, true));
+
+        //backward
+        assertEquals(B_EXPECT_1X, rotateString1(STRING, 1, false));
+        assertEquals(B_EXPECT_2X, rotateString1(STRING, 2, false));
+        assertEquals(B_EXPECT_3X, rotateString1(STRING, 3, false));
+        assertEquals(B_EXPECT_6X, rotateString1(STRING, 6, false));
+        assertEquals(B_EXPECT_7X, rotateString1(STRING, 7, false));
+        assertEquals(B_EXPECT_24X, rotateString1(STRING, 24, false));
+    }
+
+    @Test
+    void whenUsingShiftString2_thenGetExpectedResults() {
+        assertEquals(EXPECT_1X, rotateString2(STRING, 1, true));
+        assertEquals(EXPECT_2X, rotateString2(STRING, 2, true));
+        assertEquals(EXPECT_3X, rotateString2(STRING, 3, true));
+        assertEquals(EXPECT_6X, rotateString2(STRING, 6, true));
+        assertEquals(EXPECT_7X, rotateString2(STRING, 7, true));
+        assertEquals(EXPECT_24X, rotateString2(STRING, 24, true));
+
+        //backward
+        assertEquals(B_EXPECT_1X, rotateString2(STRING, 1, false));
+        assertEquals(B_EXPECT_2X, rotateString2(STRING, 2, false));
+        assertEquals(B_EXPECT_3X, rotateString2(STRING, 3, false));
+        assertEquals(B_EXPECT_6X, rotateString2(STRING, 6, false));
+        assertEquals(B_EXPECT_7X, rotateString2(STRING, 7, false));
+        assertEquals(B_EXPECT_24X, rotateString2(STRING, 24, false));
+    }
+
+    @Test
+    void whenUsingRotateFrom_thenGetExpectedResults() {
+        assertTrue(rotatedFrom(EXPECT_7X, STRING));
+        assertTrue(rotatedFrom(B_EXPECT_3X, STRING));
+        assertFalse(rotatedFrom("abcefgd", STRING));
+    }
+}
\ No newline at end of file
diff --git a/core-java-modules/pom.xml b/core-java-modules/pom.xml
index f16cff3987..639a02a8cf 100644
--- a/core-java-modules/pom.xml
+++ b/core-java-modules/pom.xml
@@ -65,7 +65,6 @@
         <module>core-java-streams-5</module>
         <module>core-java-streams-collect</module>
         <module>core-java-streams-maps</module>
-        <module>core-java-string-algorithms-3</module>
         <!--<module>core-java-string-operations-3</module>--> <!-- failing after upgrading to jdk17 -->
         <module>core-java-string-operations-4</module>
         <!--<module>core-java-string-operations-5</module>--> <!-- failing after upgrading to jdk17 -->
@@ -185,6 +184,8 @@
         <module>core-java-streams-3</module>
         <module>core-java-string-algorithms</module>
         <module>core-java-string-algorithms-2</module>
+        <module>core-java-string-algorithms-3</module>
+        <module>core-java-string-algorithms-4</module>
         <module>core-java-string-apis</module>
         <!--<module>core-java-string-apis-2</module>--> <!-- failing after upgrading to jdk17 -->
         <module>core-java-swing</module>