Merge branch '13-add-clear-function' into 'main'

Resolve "Add clear function"

Closes #13

See merge request !20

stack.c

-#include <stdlib.h>
-#include <stdbool.h>
-#include <stdio.h>
-
 #include "stack.h"
-
+#include <stdio.h>
+#include <stdlib.h>
 
 #define DEFAULT_CAPACITY 4
 
@@ -87,4 +84,17 @@ int get_length(stack s) {
 bool stack_is_empty(stack s)
 {
     return s.top == -1;
+}
+
+/**
+ * @brief Reset the stack's top to -1
+ *        New values will overwrite the old ones 
+ * 
+ * @param s
+ */
+void stack_clear(stack *s) 
+{
+    s->top = -1;
+    s->capacity = DEFAULT_CAPACITY;
+    s->data = realloc(s->data, sizeof(int) * s->capacity);
 }
\ No newline at end of file

stack.h

+
 #ifndef _STACK_H_
 #define _STACK_H_
 
+#include <stdbool.h>
+
+
 typedef struct _stack {
     int *data;
     int capacity;
@@ -17,6 +21,7 @@ void stack_peek(stack s, int *value);
 void stack_clone(stack s, stack *clone);
 int get_length(stack s);
 bool stack_is_empty(stack s);
+void stack_clear(stack *s) ;
 
 void stack_print(const stack s);