Write a function that receives a string. It should return True
if the string begins with the letter 'x' (lowercase or capital).
Examples:
startsWithX("x-men")
returns True
startsWithX("X-Men")
returns True
startsWithX("The Incredible X-Men")
returns False
startsWithX("")
returns False
startsWithX("xOxOx")
returns True
©2017 Graham Mitchell