I am swapping structure lexicographically by name. Is there any way to improve the code when the structure entries are heavy.

Here is the code

#include<stdio.h>
#include<string.h>
struct College
{
    char name[100];
    char city[100];
    int yearOfEstablishment;
    float passPercentage;
};
void displayCollegeDetails(struct College c)
{
    printf("Name : %s\n",c.name);
    printf("City: %s\n",c.city);
    printf("Year of establishment : %d\n",c.yearOfEstablishment);
    printf("Pass percentage: %.2f\n",c.passPercentage);
}
void swap(struct College *a,struct College *b)
{
    struct College temp;
    temp = *a;
    *a = *b;
    *b = temp;
}
int main()
{

    int n,i,j;
    //char name[100],city[100];
    //float paasPercentage;
    printf("Enter the number of colleges\n");
    scanf("%d",&n);
    struct College c[n];
    if(n<=0)
    {
        printf("Invalid Input\n");
        return 0;
    }

    for(i=0; i<n; i++)
    {
        fflush(stdin);
        printf("Enter the details of college %d\n",i+1);
        printf("Enter name\n");
        scanf("%s",c[i].name);
        printf("Enter city\n");
        scanf("%s",c[i].city);
        printf("Enter year of establishment\n");
        scanf("%d",&c[i].yearOfEstablishment);
        printf("Enter pass percentage\n");
        scanf("%f",&c[i].passPercentage);
    }
    for(i=0; i<n-1; i++)
    {
        for(j=i+1; j<n; j++)
        {
            if(strcmp(c[i].name,c[j].name)>0)
            {
                swap(&c[i],&c[j]);
            }
        }
    }
    printf("Details of colleges\n");
    for(i=0; i<n; i++)
    {
        fflush(stdin);
        printf("College %d\n",i+1);
        displayCollegeDetails(c[i]);
    }
    return 0;