RAD 2 Homework 4 - Write a new trigger and handler class from scratch

CaseTrigger.trigger

trigger CaseTrigger on Case (before insert, before update, before delete, after insert, after update, after delete, after undelete) {
    
    if(Trigger.isInsert && Trigger.isBefore){
        CaseTriggerHandler.onBeforeInsert(Trigger.new);
    }
    
    if(Trigger.isInsert && Trigger.isAfter){
        CaseTriggerHandler.onAfterInsert(Trigger.new);
    }
    
    if(Trigger.isUpdate && Trigger.isBefore){
        CaseTriggerHandler.onBeforeUpdate(Trigger.old, Trigger.new, Trigger.oldMap, Trigger.newMap);
    }
    
    if(Trigger.isUpdate && Trigger.isAfter){
        CaseTriggerHandler.onAfterUpdate(Trigger.old, Trigger.new, Trigger.oldMap, Trigger.newMap);
    }
    
    else if(Trigger.isDelete && Trigger.isBefore){
        CaseTriggerHandler.onBeforeDelete(Trigger.old, Trigger.oldMap);
    }

    else if(Trigger.isDelete && Trigger.isAfter){
        CaseTriggerHandler.onAfterDelete(Trigger.old, Trigger.oldMap);
    }
    
    else if(Trigger.isUndelete){
        CaseTriggerHandler.onUndelete(Trigger.new, Trigger.newMap);
    }
}