Create a function that will remove the letters "a", "b" and "c" from the given string and return the modified version. If the given string does not contain "a", "b", or "c", return "".
removeABC("This might be a bit hard") ➞ "This might e it hrd"
removeABC("hello world!") ➞ ""
removeABC("") ➞ ""If the given string does not contain "a", "b", or "c", return "".