move exercises, lecture examples, labs into subfolders

Exercises/C4/declare_a_string.c

@@ -0,0 +1,13 @@
+#include <stdio.h>
+#include <stdlib.h>
+int main(void)
+{
+	// A variable to store a name (maximum 49 characters)
+	char Name[50];
+    
+	// Declare multiple strings on the same line 
+	char AddressLine1[100], AddressLine2[100], PostCode[10];
+
+	// all done
+	return 0;
+}