code: protected function migrationToClassName( $migrationName )
      {
          $class = str_replace('_', ' ', $migrationName);
          $class = ucwords($class);
          $class = str_replace(' ', '', $class);
  
          if (!$this->isValidClassName($class)) {
              throw new \InvalidArgumentException(sprintf(
                  'Migration class "%s" is invalid',
                  $class
              ));
          }
  
          return $class;
      }
docs: transform create_table_user to CreateTableUser
  @param $migrationName
  @return string