removeDuplicateConsecutiveSubstring

string s = removeDuplicateConsecutiveSubstring("AAAAbooeAAAuuvAww", "A");
assert(s == "AbooeAuuvAww");
s = removeDuplicateConsecutiveSubstring("AAAAbcooeAAAgguvAww", "AA");
assert(s == "AAbcooeAAAgguvAww");