input: Write a python function to get a dictionary with keys that start with a given prefix.
  assert get_dict_with_prefix({"key1": "value1", "key2": "value2", "key3": "value3", "prefix_key1": "value4", "prefix_key2": "value5"}, "prefix_") == {"prefix_key1": "value4", "prefix_key2": "value5"}
  assert get_dict_with_prefix({"apple": 1, "application": 2, "banana": 3, "apply": 4}, "app") == {"apple": 1, "application": 2, "apply": 4}
  assert get_dict_with_prefix({"a1": 10, "b1": 20, "a2": 30, "b2": 40}, "b") == {"b1": 20, "b2": 40}
output: def get_dict_with_prefix(d, prefix):
      return {k: v for k, v in d.items() if k.startswith(prefix)}