input: Write a python function to convert a list of dictionaries to a JSON string.
  assert dicts_to_json([{'name': 'John', 'age': '22'}, {'name': 'Bob', 'age': '33'}]) == '[{"name": "John", "age": "22"}, {"name": "Bob", "age": "33"}]'
  assert dicts_to_json([{'name': 'Alice', 'age': '30'}, {'name': 'Eve', 'age': '25'}]) == '[{"name": "Alice", "age": "30"}, {"name": "Eve", "age": "25"}]'
  assert dicts_to_json([]) == '[]'
output: import json
  
  def dicts_to_json(dict_list):
      return json.dumps(dict_list)