fix: Add a const qualifier to a cast from a const argument

The flag -Wcast-qual issues errors when a qualifier (e.g., const) is removed
through a cast.

Signed-off-by: Miguel Silva <[email protected]>

Author: miguelafsilva5

src/lib/string.c

@@ -17,7 +17,7 @@ void* memcpy(void* dst, const void* src, size_t count)
             if (i + (WORD_SIZE - 1) > count - 1) {
                 break;
             }
-            *(unsigned long*)dst_tmp = *(unsigned long*)src_tmp;
+            *(unsigned long*)dst_tmp = *(const unsigned long*)src_tmp;
             dst_tmp += WORD_SIZE;
             src_tmp += WORD_SIZE;
         }