Write a static method that receives a String. It should return true if the string begins with the letter 'x' (lowercase or capital).
You must use .substring().
Examples:
startsWithX("x-men") returns truestartsWithX("X-Men") returns truestartsWithX("The Incredible X-Men") returns falsestartsWithX("") returns falsestartsWithX("xOxOx") returns true©2003–2016 Graham Mitchell
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