some libs done

lib/print.c

@@ -0,0 +1,14 @@
+#include "print.h"
+#include <stdarg.h>
+#include <stdio.h>
+
+int printfn(char *format, ...) {
+  int len;
+  va_list args;
+  va_start(args, format);
+  printf("yait: ");
+  len = vfprintf(stderr, format, args);
+  putchar('\n');
+  va_end(args);
+  return len;
+}