Change variable name

core-kotlin/src/test/kotlin/com/baeldung/stringcomparison/StringComparisonTest.kt

@@ -19,9 +19,9 @@ class StringComparisonUnitTest {
     fun `compare using referential equals operator`() {
         val first = "kotlin"
         val second = "kotlin"
-		val firstBuildAgain = buildString { "kotlin" }
+        val copyOfFirst = buildString { "kotlin" }
         assertTrue { first === second }
-		assertFalse { first === firstBuildAgain }
+        assertFalse { first === copyOfFirst }
     }
 
     @Test