Finished the stack unwinding and winding functionality

examples/fork.c

@@ -0,0 +1,33 @@
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <errno.h>
+
+int forkexample()
+{
+    int x = 1;
+
+    int pid = fork();
+    if (pid == -1) {
+        printf("failed to fork - %d", errno);
+        return 1;
+    }
+
+    if (pid == 0)
+        printf("Child has x = %d\n", ++x);
+    else {
+        printf("Parent has x = %d\n", --x);
+
+        int status = 0;
+        waitpid(pid, &status, 0);
+        printf("Child(%d) exited with %d\n", pid, status);
+    }
+
+    return 0;
+}
+int main()
+{
+    forkexample();
+    return 0;
+}