Implement function `searchFile`. You give a substring, functions returns true if query satisfied to filename or false;

searchFile('crdle', 'crocodile.txt') // true
searchFile('le', 'crocodile.txt') // true
searchFile('el', 'crocodile.txt') // false
searchFile('coco', 'crocodile.txt') // true
searchFile('crdleee', 'crocodile.txt') // false
searchFile('crkdl', 'crocodile.txt') // false

Tip: `two pointers`