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

void copyfile(char destination[], char source[])
{
    FILE        *fp_in   = fopen(source, "rb");
    FILE        *fp_out  = fopen(destination,  "wb");

//  ENSURE THAT OPENING BOTH FILES HAS BEEN SUCCESSFUL
    if(fp_in != NULL && fp_out != NULL) {

        char    buffer[BUFSIZ];
        size_t  got, wrote;

        while( (got = fread(buffer, 1, sizeof buffer, fp_in)) > 0) {  
            wrote = fwrite(buffer, 1, got, fp_out);
            if(wrote != got) {
                printf("error copying files\n");
                exit(EXIT_FAILURE);
            }
        }

    }

//  ENSURE THAT WE ONLY CLOSE FILES THAT ARE OPEN
    if(fp_in != NULL) {
        fclose(fp_in);
    }
    if(fp_out != NULL) {
        fclose(fp_out);
    }
}