Using Python.

Implement a function substrings that returns a list of all substrings of a string. For example, the substrings of the string "rum" are the seven strings: "r", "ru", "rum", (Hint: first generate all substrings that start with the first character. There are n of them if the string has length n. Then generate the substrings of the string that you obtain by removing the first character.) Example output: Substrins of the string run: I'r', 'u', 'run', ', un', n', "] Substrings of the string article l'a', 'ar', art', 'arti', 'artic', articl', 'article, 'r', 'rt', 'rti', 'rtic', rticl', 'rticle', 't', 'ti, 'tic, 'ticl', ticle', i, 'ic, 'icl', icle', 'c', 'cl', 'cle, e