input: Write a python function to add and remove students from a list.
  assert student_list.students == []
  student_list.add_student('John')
  assert student_list.students == ['John']
  student_list.add_student('Jane')
  assert student_list.students == ['John', 'Jane']
  student_list.remove_student('John')
  assert student_list.students == ['Jane']
output: class StudentList:
      def __init__(self):
          self.students = []
  
      def add_student(self, name):
          self.students.append(name)
  
      def remove_student(self, name):
          if name in self.students:
              self.students.remove(name)
  
  student_list = StudentList()