changed FireManager FirefighterManager to work better but still not done yet

.gradle/8.10.2/executionHistory/executionHistory.lock

.gradle/8.10.2/fileHashes/fileHashes.lock

.gradle/buildOutputCleanup/buildOutputCleanup.lock

src/main/java/model/FireManager.java

src/main/java/model/FirefighterManager.java

src/main/java/util/Position.java