Implement a method that will find a class containing a method with a specified name. This method accepts two arguments, the name of the method and an array of fully-qualified class names, where:
methodName is the name of the method that needs to be found;
classNames contains one class that has the method with the given name.
It should return the fully-qualified name of the class that has the method with the given name.
For example, the method name is abs and possible classes are java.lang.String, java.lang.StringBuffer and java.lang.Math.
String and StringBuffer have no method with the name abs. So they are not the class we are looking for.
Math class has a method with the name abs. The method should return the fully-qualified name of Math class, java.lang.Math in this case.
