feat: initial version

srcs/ft_memcpy.c

@@ -0,0 +1,12 @@
+#include <stddef.h>
+
+void *ft_memcpy(void *dst, const void *src, size_t n) {
+    unsigned char *d = (unsigned char *)dst;
+    const unsigned char *s = (const unsigned char *)src;
+
+    while (n--) {
+        *d++ = *s++;
+    }
+
+    return dst;
+}