fix(guide): simplify directory structure

guide/english/csharp/do-while-loop/index.md

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+---
+title: Do while loop
+---
+
+# Do while Loop
+
+The `do while` loop executes a block of code once and until a condition is false. They are a particular case of <a href='https://guide.freecodecamp.org/csharp/while-loop' target='_blank' rel='nofollow'>`while` loops</a>: they execute a block of code one time and then until the condition is false. A common use of `do while` loops are input checks.
+
+## Example
+```
+do
+{
+    //execute code block
+
+
+} while(boolean expression);
+
+
+string input = "";
+do
+{
+	Console.WriteLine("Type A to continue: ");
+	input = Console.ReadLine();
+} while(input != "A");
+
+Console.WriteLine("Bye!");
+```
+
+## Output:
+```
+> Type A to continue: b
+> Type A to continue: g
+> Type A to continue: A
+> Bye!
+```
+
+#### More Information:
+
+* [Microsoft C# - do](https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/do)
+* [Dot Net Perls - do](https://www.dotnetperls.com/do)