input: Write a function to create a dictionary containing student names and their corresponding marks as key-value pairs. If the input is empty, return an empty dictionary.
  
  assert construct_student_marks({ 
      "John" : 90, 
      "Levi" : 85, 
      "Jill" : 95, 
      "Sara" : 75
  }) == { 
      "John" : 90, 
      "Levi" : 85, 
      "Jill" : 95, 
      "Sara" : 75
  }
  assert construct_student_marks({}) == {}
output: def construct_student_marks(input_dict):
      return input_dict