move exercises and lectures into subfolders

Exercises/C7/Getchar/getchar_example.c

@@ -0,0 +1,20 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(void)
+{
+    // declare variable
+    char c;
+
+    printf("Input a character: ");
+    // Wait for a kepypress, store result in c
+    c = getchar();
+
+    // Display on the screen using printf
+    printf ("The charcter pressed was %c\n", c);
+
+    // Display the charcter using putchar()
+    putchar(c);
+    
+    return 0;	    // Exit from main
+}