Write a method that counts how many times 'ltr' occurs in 'str'. Note that 'ltr' is a string, but it will always contain exactly one character. The string 'str' may contain any number of characters. Return a string that states how many times 'ltr' occurs. That string must be grammatically correct, so if it occurs exactly once you must end with "1 time.", but for any other number of times it should say "X times." (where X is the number of times it occurs). Look at the test data for examples.