Added: ReverseString.kt

src/main/kotlin/strings/ReverseString.kt

@@ -0,0 +1,27 @@
+package strings
+
+/**
+ * Reverses a given string
+ *
+ * @param str The input string to be reversed.
+ * @return The reversed string.
+ */
+fun reverseString(str: String): String {
+ if (str.isNullOrEmpty()) {
+ return str
+ }
+
+ val charArray = str.toCharArray()
+ var i = 0
+ var j = str.length - 1
+
+ while (i < j) {
+ val temp = charArray[i]
+ charArray[i] = charArray[j]
+ charArray[j] = temp
+ i++
+ j--
+ }
+
+ return String(charArray)
+}

src/test/kotlin/strings/ReverseStringTest.kt

@@ -0,0 +1,35 @@
+package strings
+
+import org.junit.Assert.assertEquals
+import org.junit.Test
+
+class ReverseStringTest {
+
+ @Test
+ fun testReverseStringWithEmptyString() {
+ val input = ""
+ val expected = ""
+ assertEquals(expected, reverseString(input))
+ }
+
+ @Test
+ fun testReverseStringWithSingleCharacter() {
+ val input = "a"
+ val expected = "a"
+ assertEquals(expected, reverseString(input))
+ }
+
+ @Test
+ fun testReverseStringWithEvenLengthString() {
+ val input = "abcdef"
+ val expected = "fedcba"
+ assertEquals(expected, reverseString(input))
+ }
+
+ @Test
+ fun testReverseStringWithOddLengthString() {
+ val input = "hello"
+ val expected = "olleh"
+ assertEquals(expected, reverseString(input))
+ }
+}