change maven target version to 11

Author: dbc2201

.gitignore

@@ -4,6 +4,7 @@ target/
 !**/src/test/**/target/
 
 ### IntelliJ IDEA ###
+.idea/
 .idea/modules.xml
 .idea/jarRepositories.xml
 .idea/compiler.xml
@@ -38,4 +39,5 @@ build/
 .DS_Store
 
 ### SonarLint ###
-.idea/sonarlint/
+
+!/.idea/sonarlint/

.idea/misc.xml

@@ -17,8 +17,8 @@
     </dependencies>
 
     <properties>
-        <maven.compiler.source>18</maven.compiler.source>
-        <maven.compiler.target>18</maven.compiler.target>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
     </properties>
 
 </project>

.idea/sonarlint/issuestore/4/4/442292b8a7efeabbe4cc176709b833b1792140ec

@@ -26,8 +26,7 @@ void shouldReturnMapOfCorrectSize(String input) {
         // Act
         var characterIntegerMap = counter.countDuplicateCharacters(input);
         // Assert
-        assertEquals(input.length(), characterIntegerMap.size(),
-                "the map should have the same size as the input string");
+        assertEquals(input.length(), characterIntegerMap.size(), "the map should have the same size as the input string");
     }
 
     @Test