Help me in solving SESO41 problem

help
,
1

My issue

sol.c:55:5: error: redefinition of ‘main’
55 | int main() {
| ^~~~
sol.c:29:5: note: previous definition of ‘main’ with type ‘int()’
29 | int main(){
| ^~~~ . this is the problem I’m getting in this code and in last module also.

My code

#include<stdio.h>
void swap(int* xp, int* yp){
    int temp= *xp;
    *xp=*yp;
    *yp=temp;
}

void selectionSort(int arr[], int n) {
    int i,j,min_idx;
    for( i=0; i<n-1; i++){
        min_idx=i;
        for(j=i+1; j<n; j++){
            if(arr[j]<arr[min_idx]){
                min_idx=j;
            }
        }
    swap(&arr[min_idx], &arr[i]);
    }
}

void printArray(int arr[], int size){
    for(int i=0; i<size; i++){
        printf("%d", arr[i]);
    }
    printf("\n");
}
int main(){
    int n;
    scanf("%d", &n);
    int arr[n];
    for(int i=0; i<n; i++){
        scanf("%d", &arr[i]);
    }
    selectionSort(arr,n);
    printArray(arr,n);
}

Learning course: Data structures & Algorithms lab
Problem Link: https://www.codechef.com/learn/course/muj-dsa-c/MUJDSAC23/problems/SESO41