input: Write a python function to create a list of employees with salary greater than a given amount.
  assert filter_high_salary([Employee('John', 'E001', 'Manager', 75000), Employee('Doe', 'E002', 'Developer', 50000)], 60000) == ['John']
  assert filter_high_salary([Employee('Alice', 'E003', 'Analyst', 90000), Employee('Bob', 'E004', 'Intern', 30000)], 40000) == ['Alice']
  assert filter_high_salary([Employee('Charlie', 'E005', 'CEO', 150000), Employee('David', 'E006', 'Clerk', 25000)], 100000) == ['Charlie']
output: def filter_high_salary(employees, amount):
      return [employee.name for employee in employees if employee.salary > amount]