Add a line to remove the rule first, in case it already existed

GiteaBlocker/main.cpp

@@ -68,6 +68,7 @@ int main(){
 				user.totalHits++;
 				if(user.totalHits>tooFrequentAccess){
 					ipBanList.insert(ipAddr);
+					std::system(std::format("iptables -D INPUT -s {} -j DROP",ipAddr).c_str()); //In case the rule already existed, we are going to remove it first... No effect if it does not exist.
 					std::system(std::format("iptables -I INPUT 1 -s {} -j DROP",ipAddr).c_str());
 					std::cout<<std::format("New offender {} detected and added to banlist!",ipAddr)<<std::endl;
 				}