feat: add ft_memcpy function

ft_memcpy.c

@@ -0,0 +1,18 @@
+#include "libft.h"
+
+void	*ft_memcpy(void *dst, const void *src, size_t n)
+{
+	size_t	i;
+	char	*srctmp;
+	char	*dsttmp;
+
+	i = 0;
+	srctmp = (char *)src;
+	dsttmp = (char *)dst;
+	while (i < n)
+	{
+		dsttmp[i] = srctmp[i];
+		i++;
+	}
+	return (dst);
+}

libft.h

@@ -61,4 +61,14 @@ void	*ft_memset(void *b, int c, size_t len);
 */
 void	ft_bzero(void *s, size_t n);
 
+/*
+	The memcpy() function copies n bytes 
+	from memory area src to memory area dst.  
+	If dst and src overlap, behavior is 
+	undefined.  Applications in which dst and 
+	src might overlap should use memmove(3) 
+	instead.
+*/
+void	*ft_memcpy(void *dst, const void *src, size_t n);
+
 #endif