move exercises and lectures into subfolders

Exercises/C4/Wrong_answer/wrong_answer.c

@@ -0,0 +1,20 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(void)
+{
+    // Declare and initialise as required
+    int a = 1,b = 4;
+    float ans;
+
+    // Perform calculation 
+    // a and b are integers so the answer will be the result of the integer division
+    
+    ans = a / b;
+
+    // Display answer
+    printf ("\nThe answer is %f",ans);
+
+    return 0;
+
+}