working on close

struct/lib_fs.c

 #include <stdio.h>
 #include <stdlib.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
 #include "lib_fs.h"
 
-// int copy(char *src, char *dst, unsigned int buf_size)
-// {
+int copy(char *src, char *dst, unsigned int buf_size)
+{
+    int fd_src = open(src, O_RDONLY);
+    int fd_dst = open(dst, O_WRONLY | O_CREAT, 0640);
 
-// }
+    close(fd_src);
+    close(fd_dst);
+}
 
 int copyf(char *src, char *dst, unsigned int buf_size)
 {

test_lib.c

@@ -15,7 +15,7 @@ int main(int argc, char **argv)
     char *src = "./src.txt";
     char *dst = "./dst.txt";
 
-    fprintf(stdout, "\nNumber of bytes copied: %d\n", copyf(src, dst, atoi(argv[1])));
+    fprintf(stdout, "\ncopyf(char %s, char %s, unsigned int %d)\tNumber of bytes copied: %d\n", src, dst, atoi(argv[1]), copyf(src, dst, atoi(argv[1])));
 
     return EXIT_SUCCESS;
 }