paran: word string variable used to search content substring string variable which represents the substring to search description: Without using any of python's built-in string apisethods, create a function find substring that returns the starting index of a substring. If no substring is found return -1 as the inde Note: index of the word begins at 0 example: > find substring ("hello word", "hello") > find substring ("hello word", "word") >> find substring ("abcdef", "cde" > find substring ("python","java")