Yeet.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Script_Hub_Uploader_Beta
{
    public static class StringExtendsionsMethods
    {
        public static string ReplaceWholeWord(this String s, String word, String bywhat)
        {
            char firstLetter = word[0];
            StringBuilder sb = new StringBuilder();
            bool previousWasLetterOrDigit = false;
            int i = 0;
            while (i < s.Length - word.Length + 1)
            {
                bool wordFound = false;
                char c = s[i];
                if (c == firstLetter)
                    if (!previousWasLetterOrDigit)
                        if (s.Substring(i, word.Length).Equals(word))
                        {
                            wordFound = true;
                            bool wholeWordFound = true;
                            if (s.Length > i + word.Length)
                            {
                                if (Char.IsLetterOrDigit(s[i + word.Length]))
                                    wholeWordFound = false;
                            }

                            if (wholeWordFound)
                                sb.Append(bywhat);
                            else
                                sb.Append(word);

                            i += word.Length;
                        }

                if (!wordFound)
                {
                    previousWasLetterOrDigit = Char.IsLetterOrDigit(c);
                    sb.Append(c);
                    i++;
                }
            }

            if (s.Length - i > 0)
                sb.Append(s.Substring(i));

            return sb.ToString();
        }
    }
}