Check if a string is palindrome or not

#include <bits/stdc++.h>
using namespace std;

string check_Palindrome(string str, int start, int end){
    if(end - start == 1 or start == end) {
        return "true";
    }
    else if(str[start] == str[end]) {
        return check_Palindrome(str, start+1, end-1);
    }
    else {
        return "false";
    }
}

int main() {
    string str;
    cin >> str;
    int n = str.size();
    cout << check_Palindrome(str, 0, n-1);
    return 0;
}