Resolve "Add peek function"

Closes #7 (closed)

stack.c

+<<<<<<< HEAD
 #include <stdio.h>
 #include "stack.h"
 
@@ -5,4 +6,7 @@ void peek(stack s, int *value){
     if(s.top>-1 && s.top<s.capacity){
         *value=s.data[s.top];
     }
-}
+}
\ No newline at end of file
+=======
+#include "stack.h"
+>>>>>>> main