reverse every 5 chars in C

#include "pch.h"
#include <iostream>
#include "stdio.h"
int inverse()
{
    int c = 0;
    char a;
    scanf("%c", &a);
    if (a != '.') {
        if (c != 5)
        {
            c = c + 1;
            inverse();
            printf("%c", a);
        };
        return 1;
    };
    return 0;
}
int main()
{
    inverse();
    while (inverse() == 1) inverse();

}