fix(guide): simplify directory structure

guide/english/csharp/return/index.md

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+---
+title: Return Statement
+---
+
+# Return Statement
+
+The `return` statement terminates execution of a method inside which it appears and returns control to the calling method. It may or may not return a value.
+
+If the `return` statement is inside a `try` block and if there is a `finally` block, then the control is passed to the `finally` block, after which it is returned to the calling method.
+
+## Example
+```
+class Calc
+{
+  static int Sum(int i, int j)
+  {
+    return i + j;
+  }
+  
+  static void Main()
+  {
+    int a = 4;
+    int b = 3;
+    int sum = Sum(a, b);
+    Console.WriteLine($"The sum of {a} and {b} is {result}");
+    
+    // To keep the console from closing
+    Console.ReadLine();
+  }
+}
+
+
+```
+
+## Output:
+```
+> The sum of 4 and 3 is 7
+``