Mastodawn

I'm working on tool to allow you to easily change your Trackpoint settings on the Lenovo thinkpads. The little nipple. I'm writing it in C to help me learn the language more. I'm having a problem I can't quite put my paw on.

The code responsible for changing the setting is:

int set_nipple_speed(int speed) {
  if (speed <= 0) {
    printf("Invalid value %d speed must be greater than 0", speed);
    return 1;
  }

  char command[100];
  char * path = get_trackpoint_path();
  sprintf(command, "echo %d | sudo tee %s/serio2/speed", speed, path);
  return system(command);
}

I'm getting:

tee: /sys/devices/platform/i8042/serio1: Is a directory
33
sh: 2: /serio2/speed: not found

Oh and theres a function being called to get the base path to get to the trackpoint settings:

char *get_trackpoint_path() {
  FILE *pipe_stream =
      popen("find /sys/devices/platform/i8042 -name name | xargs grep -Fl "
            "TrackPoint | sed 's/\\/input\\/input[0-9]*\\/name$//'",
            "r");
  char path[2048];
  if (pipe_stream == NULL) {
    printf("Failed to run command to find trackpoint path");
    return NULL;
  }
  fgets(path, sizeof(path), pipe_stream);
  pclose(pipe_stream);
  char *path_ptr = path;
  return path_ptr;
}

Would anyone be willing to help me #debug this? I'm pretty new to C. Project is here #codinghelp