linter fix

Signed-off-by: JeevaRamanathan <jeevaramanathan.m@infosys.com>

Author: JeevaRamanathan

src/test/java/com/thealgorithms/strings/IsogramTest.java

@@ -89,4 +89,4 @@ void testEmptyStringByArray() {
     void testEmptyStringByLength() {
         assertEquals(true, Isogram.isIsogramByLength(""));
     }
- }
+}