Anchor Tag appending extra text from html template

[rajashripise]

I am creating the html template using the anchor tag to add link but text getting appended in anchor tag
this is my tag

  <a href="ResetUri" title="Reset" style="font-size: 20px; font-family: Helvetica, Arial, sans-serif; color: #ffffff; text-decoration: none; color: #ffffff; text-decoration: none; padding: 15px 25px; border-radius: 2px; border: 1px solid #539be2; display: inline-block;">
      Reset Password
  </a>

ResetUri value is
https://domain-name.b2clogin.com/domain-name.com/B2C_1_DevTestPasswordReset/oauth2/v2.0/authorize?p=B2C_1_DevTestPasswordReset&client_id=1f933-4120-b2a1-a81ba10bc&redirect_uri=https://application-uri-development.azurewebsites.net&scope=openid&response_type=id_token&prompt=login

getting result text as :
Reset Password [domain-name.b2clogin.com]

getting result as follow

extra text getting updated

 var replacements = new Dictionary<string, string>
             {
                 {
                 "{LoginUri}", loginUrl
                 },
                 {
                 "ResetUri", resetPasswordUrl
                 },
                 {
                 "{UserPasssowrd}", userPasssowrd
                 },
                 {
                 "{Subject}", "Invitation"
                 }
             };

var plaintextcontent = string.Empty;
string filePath = Path.Combine(System.IO.Directory.GetCurrentDirectory(), "Files", "UserInvitation.html");
string content = string.Empty;
using (StreamReader reader = new StreamReader(filePath))
{
    content = reader.ReadToEnd();
}
plaintextcontent = content;
foreach (var replacement in replacements)
{
    content = content.Replace(replacement.Key, replacement.Value);
}
var result = MailHelper.CreateSingleEmail(new SendGrid.Helpers.Mail.EmailAddress(fromAddress), new SendGrid.Helpers.Mail.EmailAddress(userName), "Invitation", "", content);
_ = await client.SendEmailAsync(result).ConfigureAwait(false);
```  This is my Code for email send