fix(guide): simplify directory structure

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

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+---
+title: do while loop
+---
+## Do While Loop
+
+The `do while loop` is almost the same as the while loop. The `do while loop` has the following form:
+```cpp
+do 
+{
+  // do something;	
+} while(expression);
+	
+```
+
+Note: Remember to use a semicolon ';' at the end of the condition.
+
+## Details about do-while loop
+
+The do-while loop is used whenever you are sure that a particular process(within the loop) has to be performed at least once. It has many advantages like not initialising the checking variable(eg- char addmore='Y') etc. The semicolon at the end of while is a must.
+
+Do something first and then test if we have to continue. The result is that the do block runs at least once. (Because the expression test comes afterward). Take a look at an example:
+
+```cpp
+#include <iostream>
+	using namespace std;
+
+	int main()
+	{
+		int counter, howmuch;
+
+		cin >> howmuch;
+		counter = 0;
+		do
+		{
+			counter++;
+			cout << counter << '\n';
+		}
+		while ( counter < howmuch);
+		return 0;
+	}
+```