input: Write a function to construct a python dictionary containing student names and marks as key-value pairs. Return the dictionary. If no input is provided, return an empty dictionary.
  def construct_student_marks_dict():
      return { 
          "John" : 90, 
          "Levi" : 85, 
          "Jill" : 95, 
          "Sara" : 75
      }
  
  assert construct_student_marks_dict() == { 
      "John" : 90, 
      "Levi" : 85, 
      "Jill" : 95, 
      "Sara" : 75
  }
output: def construct_student_marks_dict():
      return {
          "John": 90,
          "Levi": 85,
          "Jill": 95,
          "Sara": 75
      }