Write a function that takes a string as a parameter and returns the same string in all capital letters followed by all lowercase letters.

capilizeAndLowercase("HelLo") // => "HELLOhello"

Write a function that takes a string as a parameter and returns a number that is half the string's length, rounded down.

Hint: You'll need to use Math.floor().
findMiddleIndex("Hello") // => 2
findMiddleIndex("Hello World") // => 5

Write a function that uses slice() and the other functions you've written to return the first half of the given string.

returnFirstHalf("Hello") // => "He"
returnFirstHalf("Hello World") // => "Hello"

Write a function that takes a string as a parameter and returns that string where the first half is capitalized, and the second half is lowercase.

Hint: If your string length is odd, use Math.floor() to round down.
capilizeAndLowercase("Hello") // => "HEllo"
capilizeAndLowercase("Hello World") // => "HELLO world"

Optional Code Challenge

(This one is a step up in difficulty and utilizes the .split() string method and .join() array method):

Write a function that takes a string as a parameter and capitalizes any character that follows a space.

capitalize("hey friends! practice practice practice!") // -> "Hey Friends! Practice Practice Practice!"