Help me in solving PPSC269 problem

help
,
1

My issue

How to remove one main

My code

#include <stdio.h>
#include <stdlib.h>

// Function to display the contents of the file
void userFunction() {
    // Use system() to run the 'cat' command and display the contents of input.txt
    system("cat /mnt/codechef/input.txt");
}

// Only one main function
int main() {
    // Call the function to display file contents
    userFunction();
    return 0;
}

Learning course: Programming and Problem solving using C
Problem Link: https://www.codechef.com/learn/course/ciet-programming-c/CIETPC37/problems/PPSC269