input: Write a function to create a python dictionary containing student names and their corresponding marks as key-value pairs. If no students are provided return an empty dictionary.
  
  assert construct_student_marks({}, {}) == {}
  assert construct_student_marks({"John": 90, "Levi": 85, "Jill": 95, "Sara": 75}, {}) == {"John": 90, "Levi": 85, "Jill": 95, "Sara": 75}
  assert construct_student_marks({}, {"Sam": 80}) == {"Sam": 80}
output: def construct_student_marks(students, new_students):
      result = students.copy()
      result.update(new_students)
      return result