I was doing this one exercise on Microsoft’s website where you were supposed to extract, replace, and remove data from an input string and get a this output:
Quantity: 5000
Output:

Widgets ®

5000

And now I wonder did I wrote a shitty or somewhat decent code?

const string input = "<div><h2>Widgets ™</h2><span>5000</span></div>";
string quantity= "";
string output = "";

const string openSpan = "<span>";
const string closeSpan = "</span>";

int openingP= input.LastIndexOf(openSpan);
int closingP= input.LastIndexOf(closeSpan);

openingP += openSpan.Length;

int length= closingP- openingP;

quantity=input.Substring(openingP, length);

string Updatedinput = input.Replace("™","®");

Updatedinput = input.Replace("</div>","");

string newUpdatedInput= Updatedinput.Remove(1,5);

Console.WriteLine(newUpdatedInput);
Console.WriteLine($"quantity-{quantity}");
Console.WriteLine(output);