Include cmd.h where needed and fix the errors.

cmd.c

 #include <string.h>
 
 #include "data.h"
+#include "cmd.h"
 #include "util.h"
 
 /*

cmd.h

 #ifndef CMD_H
 #define CMD_H
 
+#include <stdbool.h>
+
 bool parse_command(struct videohub_data *d, char *cmd);
-bool parse_text_buffer(struct videohub_data *data, char *cmd_buffer);
+int parse_text_buffer(struct videohub_data *data, char *cmd_buffer);
 
 #endif