add solution week 185 task 1 in python

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diff --git a/challenge-185/steven-wilson/python/ch-01.ipynb b/challenge-185/steven-wilson/python/ch-01.ipynb
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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "id": "0898b4b4",
+   "metadata": {},
+   "source": [
+    "# Task 1: MAC Address\n",
+    "\n",
+    "You are given MAC address in the form i.e. hhhh.hhhh.hhhh.\n",
+    "\n",
+    "Write a script to convert the address in the form hh:hh:hh:hh:hh:hh.\n",
+    "\n",
+    "Example 1\n",
+    "```\n",
+    "Input:  1ac2.34f0.b1c2\n",
+    "Output: 1a:c2:34:f0:b1:c2\n",
+    "```\n",
+    "Example 2\n",
+    "```\n",
+    "Input:  abc1.20f1.345a\n",
+    "Output: ab:c1:20:f1:34:5a\n",
+    "```"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "id": "6cafcb43",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import re"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "id": "86a7b3f6",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "ex1 = \"1ac2.34f0.b1c2\"\n",
+    "ex2 = \"abc1.20f1.345a\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "8ac1ec54",
+   "metadata": {},
+   "source": [
+    "Work out a regular expressions to break up the mac address and capture groups.  It's pretty long, I'm sure there is a more consise way to express it."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "id": "a8094e85",
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "'1a:c2:34:f0:b1:c2'"
+      ]
+     },
+     "execution_count": 3,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "result = re.search(r'([\\w]{2})([\\w]{2})\\.([\\w]{2})([\\w]{2})\\.([\\w]{2})([\\w]{2})', ex1)\n",
+    "\":\".join(result.groups())"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "ff372d91",
+   "metadata": {},
+   "source": [
+    "Put this into function for reuse and test the examples above:"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "id": "cfa8172d",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "1a:c2:34:f0:b1:c2\n"
+     ]
+    }
+   ],
+   "source": [
+    "def convert_mac(mac):\n",
+    "    result = re.search(r'([a-z0-9]{2})([a-z0-9]{2})\\.([a-z0-9]{2})([a-z0-9]{2})\\.([a-z0-9]{2})([a-z0-9]{2})', mac)\n",
+    "    return \":\".join(result.groups())\n",
+    "\n",
+    "print(convert_mac(ex1))"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "id": "dcbe6934",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "ab:c1:20:f1:34:5a\n"
+     ]
+    }
+   ],
+   "source": [
+    "print(convert_mac(ex2))"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.8.10"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}