(Solved) : Hi Code C Errors Someone Help Fix Produce Working Ouptut Showed Testing Thanks Include Inc Q31642195 . . . .

hi, the below code is C++ and has errors can someone help fixthis to produce a working ouptut showed in testing. Thanks

#include <unistd.h>
#include <cstdlib>
#include <string>
#include <iostream>
#include <algorithm>

using namespace std;

void replace(std::string&str,const std::string&oldstr,conststd::string&newStr);
void replace (std::string);
void wordsearch(string p, string w);
void prefixsearch(string p, string w);
void embeddsearch(string p, string w);
void anysearch(string p, string w);
string lowercase(string s);

int size_tpos, pos, oldStr;

bool case_insensitive = true;
bool reverse_match = false;

int main(int argc, char* argv[]) {

enum MODE {
WHOLE, PREFIX, SUFFIX, ANYWHERE, EMBEDDED
}

mode = WHOLE;
  
int c;
while ((c = getopt(argc, argv, “:wpsaev”)) != -1) {
switch (c) {
case ‘w’: // pattern matches whole word
mode = WHOLE;
break;
case ‘p’: // pattern matches prefix
mode = PREFIX;
break;
case ‘a’: