move exercises and lectures into subfolders

Exercises/C13/AccessingViaPointers/accessing_via_pointers.c

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+#include <stdio.h>
+#include <stdlib.h>
+
+int main (void )
+{
+    // Declare a in integer
+    int c,d;
+
+	// Declar and integer pointer
+	int *ptrC;
+
+	// Some assgnments
+    c = 10; // C now contains the value 10
+    ptrC = &c;   // ptrC now 'Points' to c
+
+    // Get the value of c via the pointer and store in d
+    d = *ptrC;  // d now contains 10
+    printf ("\nThe value in d is %d", d);
+
+    // Change the value of c via the pointer ptrC
+    *ptrC = 1;  //c now contains 1
+    printf ("\nThe value in c is %d", c);
+
+	return 0;   // exit
+}