Note taker

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

int main(int argc, char *argv[])
{
   FILE *fd;

// Allocating memory on the heap
 char *userinput = malloc(20);
 char *outputfile = malloc(20);

 if(argc < 2)
{
   printf("Usage: %s <string to be written to /tmp/notes>\n", argv[0]);
   exit(0);
}

// Copy data into heap memory
 strcpy(outputfile, "/tmp/notes");
 strcpy(userinput, argv[1]);

// Print out some debug messages
 printf("---DEBUG--\n");
 printf("[*] userinput @ %p: %s\n", userinput, userinput);
 printf("[*] outputfile @ %p: %s\n", outputfile, outputfile);
 printf("[*] distance between: %d\n", outputfile - userinput);
 printf("----------\n\n");

// Writing the data out to the file.
 printf("Writing to \"%s\" to the end of %s...\n", userinput, outputfile);
 fd = fopen(outputfile, "a");
 if (fd == NULL)
 {
   fprintf(stderr, "error opening %s\n", outputfile);
   exit(1);
 }
 fprintf(fd, "%s\n", userinput);
 fclose(fd);

 return 0;
}