<p><strong>HTML entity parser</strong> is the parser that takes HTML code as input and replace all the entities of the special characters by the characters itself.</p>

<p>The special characters and their entities for HTML are:</p>

<ul>
	<li><strong>Quotation Mark:</strong> the entity is <code>&amp;quot;</code> and symbol character is <code>&quot;</code>.</li>
	<li><strong>Single Quote Mark:</strong> the entity is <code>&amp;apos;</code> and symbol character is <code>&#39;</code>.</li>
	<li><strong>Ampersand:</strong> the entity is <code>&amp;amp;</code> and symbol character is <code>&amp;</code>.</li>
	<li><strong>Greater Than Sign:</strong> the entity is <code>&amp;gt;</code> and symbol character is <code>&gt;</code>.</li>
	<li><strong>Less Than Sign:</strong> the entity is <code>&amp;lt;</code> and symbol character is <code>&lt;</code>.</li>
	<li><strong>Slash:</strong> the entity is <code>&amp;frasl;</code> and symbol character is <code>/</code>.</li>
</ul>

<p>Given the input <code>text</code> string to the HTML parser, you have to implement the entity parser.</p>

<p>Return <em>the text after replacing the entities by the special characters</em>.</p>

<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>

<pre>
<strong>Input:</strong> text = &quot;&amp;amp; is an HTML entity but &amp;ambassador; is not.&quot;
<strong>Output:</strong> &quot;&amp; is an HTML entity but &amp;ambassador; is not.&quot;
<strong>Explanation:</strong> The parser will replace the &amp;amp; entity by &amp;
</pre>

<p><strong class="example">Example 2:</strong></p>

<pre>
<strong>Input:</strong> text = &quot;and I quote: &amp;quot;...&amp;quot;&quot;
<strong>Output:</strong> &quot;and I quote: \&quot;...\&quot;&quot;
</pre>

<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>

<ul>
	<li><code>1 &lt;= text.length &lt;= 10<sup>5</sup></code></li>
	<li>The string may contain any possible characters out of all the 256 ASCII characters.</li>
</ul>

class Solution {
public:
    string entityParser(string text) {
        unordered_map<string,char> mp;
        mp["&quot;"]='\"';
        mp["&apos;"]='\'';
        mp["&amp;"]='\&';
        mp["&gt;"]='\>';
        mp["&lt;"]='\<';
        mp["&frasl;"]='\/';
        int n = text.length();
        string ans = "";
        for(int i = 0;i<n;i++)
        {
            if(text[i]=='\&')
            {
                string temp = "";
                int c = 0;
                while(true and i<n)
                {
                    if(text[i]=='\&')
                    {
                        if(c==0)
                        {
                            c++;
                        }
                        else
                        {
                            break;
                        }
                        
                    }
                    temp+=text[i];
                    i++;
                    if(text[i-1]=='\;')
                    {
                        break;
                    }
                }
                if(mp.find(temp)!=mp.end())
                {
                    ans += mp[temp];
                }
                else
                {
                    ans+=temp;
                }
                
                i--;
            }
            else
            {
                ans+=text[i];
            }
        }
        return ans;

        
    }
};
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