     "metadata": {},
     "source": [
      "## Problem: Determine if a string s1 is a rotation of another string s2, by calling (only once) a function is_substring\n",
      "\n",
      "* [Constraints and Assumptions](#Constraints-and-Assumptions)\n",
      "* [Test Cases](#Test-Cases)\n",
      "* [Algorithm](#Algorithm)\n",
      "* [Code](#Code)\n",
      "* [Unit Test](#Unit-Test)"
     ]
 
</s>
    "* [Constraints](#Constraints)\n",
     "metadata": {},
     "source": [
      "## Problem: Determine if a string s1 is a rotation of another string s2, by calling (only once) a function is_substring\n",
      "\n",
    "* [Constraints](#Constraints)\n",
      "* [Test Cases](#Test-Cases)\n",
      "* [Algorithm](#Algorithm)\n",
      "* [Code](#Code)\n",
      "* [Unit Test](#Unit-Test)"
     ]
keep keep keep keep replace keep keep keep keep keep
 Fixed Constraints section label and link anchor.
arrays_strings/rotation/rotation_solution.ipynb