move exercises, lecture examples, labs into subfolders

Exercises/C7/ex4.c

@@ -0,0 +1,11 @@
+#include <stdio.h>
+
+int main() {
+	char name[200] = { 0 };
+
+	printf("What is your name? ");
+	scanf("%s", name);
+
+	printf("Hello %s\n", name);
+
+}