input: Write a function to create a dictionary containing student names and their corresponding marks. The function should return the dictionary.
  
  assert create_student_marks_dict() == { 
      "John" : 90, 
      "Levi" : 85, 
      "Jill" : 95, 
      "Sara" : 75
  }
  
  return create_student_marks_dict() == { 
      "John" : 90, 
      "Levi" : 85, 
      "Jill" : 95, 
      "Sara" : 75
  }
output: def create_student_marks_dict():
      return {
          "John": 90,
          "Levi": 85,
          "Jill": 95,
          "Sara": 75
      }