Update MentOs code to the latest development version.

programs/touch.c

@@ -0,0 +1,37 @@
+///                MentOS, The Mentoring Operating system project
+/// @file touch.c
+/// @brief
+/// @copyright (c) 2014-2021 This file is distributed under the MIT License.
+/// See LICENSE.md for details.
+
+#include <sys/unistd.h>
+#include <string.h>
+#include <stdio.h>
+#include <fcntl.h>
+
+int main(int argc, char** argv)
+{
+    if (argc != 2) {
+        printf("%s: missing operand.\n", argv[0]);
+        printf("Try '%s --help' for more information.\n\n", argv[0]);
+        return 1;
+    }
+    if (strcmp(argv[1], "--help") == 0) {
+        printf(
+            "Updates modification times of a given fine. If the does not"
+            "exists, it creates it.\n"
+        );
+        printf("Usage:\n");
+        printf("    touch <filename>\n");
+        return 0;
+    }
+    int fd = open(argv[1], O_RDONLY, 0);
+    if (fd < 0) {
+        fd = open(argv[1], O_CREAT, 0);
+        if (fd >= 0) {
+            close(fd);
+        }
+    }
+    printf("\n");
+    return 0;
+}