Roy is preparing for his test in english. he creates lots of memory tools and studies using a circuit-learning schedule that he follows for several nights. he feels all the memory tools he created will prepare him for just about any kind of test the teacher throws his way. as he walks to class, he repeats to himself, "i am an awesome english student, and i can do anything! " what can roy do to improve his test-taking strategy?

Write a method public static string getdigits(string phonenumber) that takes an 11-character phone number written with any combination of 11 uppercase letters, lowercase letters and/or digits, and zero or more hyphens, and which returns the digits that a person would have to press on a cell phone to dial that phone number. we will use the mapping of letters to digits given at en. wikipedia. org/wiki/telephone_keypad# /media/file: telephone-keypad2.svg you may assume that the string parameter phonenumber contains some combination of exactly 11 uppercase letters, lowercase letters and/or digits, but that any number of hyphens may be present. you can assume that a hyphen will not appear as the first or last character of the string. do not assum