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Anagram/Anagram.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+  </PropertyGroup>
+
+</Project>

Anagram/Program.cs

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+using System;
+
+namespace Anagram
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.WriteLine(Check("rail safety", "fairy tales")); //Should return true
+            Console.WriteLine(Check("roast beef", "eat for BSE")); //Should return true (ignores spaces)
+            Console.WriteLine(Check("DeBiT CaRd", "BAD CREDIT")); //Should return true (ignores case)
+            Console.WriteLine(Check("empty", "light")); //Should return false (not an anagram)
+            Console.WriteLine(Check("a", "aa")); //Should return false (not of equal length)
+            Console.WriteLine(Check("William Shakespeara", "I am a weakish speller")); //Should return false (spelling error)
+        }
+
+        private static bool Check(string s1, string s2)
+        {
+            s1 = s1.Replace(" ", String.Empty).ToLower();
+            s2 = s2.Replace(" ", String.Empty).ToLower();
+            //If the string lengths aren't equal, they cannot be an anagram.
+            if (s1.Length != s2.Length)
+                return false;
+
+            while (s1.Length > 0)
+            {
+                if (!s2.Contains(s1[0]))
+                    return false;
+
+                s2 = s2.Remove(s2.IndexOf(s1[0]), 1);
+                s1 = s1.Remove(0, 1);
+            }
+
+            return true;
+        }
+    }
+}