input: Write a function to convert a string from UpperCamelCase to lower_snake_case.
  assert convert_to_lower_snake_case("UpperCamelCase") == "upper_camel_case"
  assert convert_to_lower_snake_case("ConvertThisString") == "convert_this_string"
  assert convert_to_lower_snake_case("AnotherExampleHere") == "another_example_here"
output: def convert_to_lower_snake_case(s):
      result = []
      for char in s:
          if char.isupper():
              if result:
                  result.append('_')
              result.append(char.lower())
          else:
              result.append(char)
      return ''.join(result)