Adding the file 4-free_grid.c and updating holberton.h

Author: AndrewB4y

0x0B-malloc_free/4-free_grid.c

@@ -0,0 +1,20 @@
+#include "holberton.h"
+#include <stdlib.h>
+
+/**
+ * free_grid - frees a 2 dimensional grid previously created with malloc
+ * @grid: double pointer to the 2d array to be freed
+ * @height: number of rows on the 2d array
+ *
+ * Return: void
+ */
+
+void free_grid(int **grid, int height)
+{
+	int i;
+
+	for (i = 0; i < height; i++)
+		free(grid[i]);
+
+	free(grid);
+}

0x0B-malloc_free/holberton.h

@@ -6,5 +6,6 @@ char *create_array(unsigned int, char);
 char *_strdup(char*);
 char *str_concat(char*, char*);
 int **alloc_grid(int, int);
+void free_grid(int**, int);
 
 #endif