refactor(cli): make main more clean and moving subcommands to the commands files

include/commands.h

@@ -0,0 +1,21 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <time.h>
+
+#include "base_file_buffer.h"
+#include "config.h"
+#include "commit.h"
+#include "hash.h"
+#include "object.h"
+#include "utilities.h"
+
+void usage(int);
+int init();
+int diff(char*, char*);
+int status();
+int commit(int, char**);
+int commit_log();