Implement function ToLowerCase() that has a string parameter str, and returns the same string in lowercase. Example 1: ~~~ Input: "Hello" Output: "hello" ~~~ Example 2: ~~~ Input: "here" Output: "here" ~~~ Example 3: ~~~ Input: "LOVELY" Output: "lovely" ~~~ ~~~ var toLowerCase = function(str) { return str.toLowerCase() }; ~~~