input: Write a python function to convert a string to "UpperCamelCase" style.
  assert convert_to_upper_camel_case("convert this string") == "ConvertThisString"
  assert convert_to_upper_camel_case("hello world") == "HelloWorld"
  assert convert_to_upper_camel_case("python naming convention") == "PythonNamingConvention"
output: def convert_to_upper_camel_case(s):
      return ''.join(word.capitalize() for word in s.split())