#include <iostream>
#include <algorithm>
#include <string>
#include <string.h>
using namespace std;
 
void replace_callID ( char* msg,  char* newVal)
{
	const string callIdToken = "CALL-ID: ";
	string s(msg);
	string u(s);
	transform(u.begin(), u.end(), u.begin(), ::toupper);
	size_t pos, pos1;
	if((pos = u.find(callIdToken)) != string::npos &&
	   (pos1 = u.find("\r\n", pos)) != string::npos)
	{
		s.replace(pos + callIdToken.length(), pos1 - pos - callIdToken.length(), newVal);
		strcpy(msg, s.c_str());
	}
}
 
int main() {
	// your code goes here
	char msg[100];
	strcpy(msg, "test\r\nCall-Id: 1234\r\ntest");
	replace_callID (msg, "1112458254");
	cout << msg;
	return 0;
}

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