fix(guide): simplify directory structure

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

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+---
+title:While-loop
+---
+
+A while loop statement repeatedly executes a target statement as long as a given condition is true.
+
+Syntax:
+while(condition) {
+   statement(s);
+}
+
+A key point of the while loop is that the loop might not ever run.
+When the condition is tested and the result is false, the loop body will be skipped and the first statement after the while loop will be executed.
+
+
+Example:
+
+```C++
+#include <iostream>
+using namespace std;
+ 
+int main () {
+   // Local variable declaration:
+   int a = 10;
+
+   // while loop execution
+   while( a < 20 ) {
+      cout << "value of a: " << a << endl;
+      a++;
+   }
+ 
+   return 0;
+}
+```
+
+Output:
+
+```
+value of a: 10
+value of a: 11
+value of a: 12
+value of a: 13
+value of a: 14
+value of a: 15
+value of a: 16
+value of a: 17
+value of a: 18
+value of a: 19
+```
+
+
+###Sources
+www.tutorialspoint.com