code: @RequestMapping(path = "/{customerId}", method = RequestMethod.DELETE)
      public ResponseEntity removeCustomer(@PathVariable("customerId") Long customerId){
          boolean succeed = customerService.removeCustomer(customerId);
          if(succeed){
              return new ResponseEntity(HttpStatus.OK);
          }else{
              return new ResponseEntity(HttpStatus.NOT_FOUND);
          }
      }
docs: Delete customer by id
  @param customerId id of the customer
  @response 200 the customer is removed
  @response 404 the customer did not exists
  @return OK if the customer is removed, NOT_FOUND if the customer did not exists