def get_docstring_start(end_signature: int, source_code: str) -> int:
	"""A function to get the start position of a docstring
	
	Parameters
	----------
	end_signature : int
		The end position of the signature of function
	source_code : str
		The source code
	
	Returns
	-------
	result : int
		The start position of docstring
	"""
	return source_code.find('\n', end_signature) + 1