Write a function which increments a string to create a new string.
1.1 should be added to the new string.IncrementString("foo") ➞ "foo1"
IncrementString("foobar0009") ➞ "foobar0010"
IncrementString("foo099") ➞ "foo100"
IncrementString("foo9") ➞ "foo10"N/A