* Problem 1: replace all internal whitespace in a string value with underscore

* ('_'), and makes it lowercase.

*

* We want to be able to convert a string to Lower Snake Case style, so that all

* leading/trailing whitespace is removed, and any internal spaces, tabs, or dots,

* are converted to '_' and all letters are lower cased.

*

* The snake() function should work like this:

*

* snake('abc') --> returns 'abc'

* snake(' ABC ') --> returns 'abc'

* snake('ABC') --> returns 'abc'

* snake('A BC') --> returns 'a_bc'

* snake(' A bC ') --> returns 'a-bc'

* snake('A BC') --> returns 'a_bc'

* snake('A.BC') --> returns 'a_bc'

* snake(' A.. B C ') --> returns 'a_b_c'

*

* @param {string} value - a string to be converted

* @return {string}

******************************************************************************/

function snake(value) {

// Replace this comment with your code...

return value;

}