Word in a frame

Write a function frameWord(word, width, height) that puts word in the middle of a frame of stars and returns the whole frame as one string.

• word is 1 to 20 Latin letters. width and height are whole numbers: the size of the frame in characters and in lines, the border included.
• The first and the last line are width stars *. Every other line starts and ends with * and has spaces inside.
• The word is in a middle line, in the middle of that line.
• If the free space to the left and to the right of the word cannot be split evenly, the extra space goes to the right. Math.floor gives you the left part.
• If the empty lines above and below the word cannot be split evenly, the extra line goes below. So the word is in the upper one of the two middle lines.
• Join the lines with '\n'. There is no '\n' at the end.
• If width is less than word.length + 2 or height is less than 3, the word does not fit: throw a RangeError.

A template literal is a short way to build one line of the frame.