Longest Palindromic Substring [Go]

[sergobot]

This issue is about Longest Palindromic Substring.

• Issue Title is in form Algo/DS Name [Language].
• I searched or browsed the repo’s other issues to ensure this is not a duplicate.
• This Algo/DS is worth adding to this repository.
• Assign this issue to me (I want to work on this).
  • I ensure that I am not already assigned to 2 or more issues.
• I will send my PR only after I'm assigned to this issue by any maintainer.
• I understand that I will be unassigned from this issue if I fail to send a PR for this within a week.

[singhpratyush]

The contributors most likely able to help are:

@Monal5031

Possible duplicate or related issues are:

• Longest Palindromic Substring [Python] #380: Longest Palindromic Substring [Python]
• Longest Palindromic Substring [JavaScript] #400: Longest Palindromic Substring [JavaScript]
• Longest Palindromic Substring [Java] #396: Longest Palindromic Substring [Java]
• Longest Palindromic Substring [CPP] #373: Longest Palindromic Substring [CPP]