Merge branch 'main' into '3-add-makefile-with-structure'

# Conflicts:
#   stack.c
#   stack.h

stack.c

-#include "../include/stack.h"
-#include <stdio.h>
+#include "stack.h"

stack.h

-#ifndef STACK_H
-#define STACK_H
+#ifndef _STACK_H_
+#define _STACK_H_
+
+typedef struct _stack {
+    int *data;
+    int capacity;
+    int top;
+} stack;
 
 #endif
\ No newline at end of file