Destroying Substrings

As we all know, a substring is a contiguous subsequence of characters of a word. For example, the substrings of the word cat would be c,a,t,ca,at,cat. Given a String S composed of only lower case characters, and a substring X also of lower case characters, your job is to remove all occurrences of X from S . For example, if the String is “banana” and the substring is an, the resulting String wou