Convert the format of Telphone Number.ipynb

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    "#need to add .str after the column to extract the elements from the string column\n",
    "df['tel1'] = '+' + df.tel.str[0] + ' (' + df.tel.str[1:4] + ') ' + df.tel.str[4:7] + '-' + df.tel.str[-4:]"
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