fix: remove casts for -Weverything

Author: Alvaro-Kothe

pandas/_libs/src/parser/tokenizer.c

@@ -1890,13 +1890,10 @@ static int copy_string_without_char(char output[PROCESSED_WORD_CAPACITY],
   size_t remaining_bytes_to_read = str_len;
 
   while (remaining_bytes_to_read > 0) {
-    right = (const char *)memchr(left, char_to_remove, remaining_bytes_to_read);
+    right = memchr(left, char_to_remove, remaining_bytes_to_read);
 
     // If it doesn't find the char to remove, just copy until EOS.
-    // We are also casting directly to size_t because
-    // `left` never goes beyond `right` or `end_ptr`.
-    size_t chunk_size =
-        right ? (size_t)(right - left) : (size_t)(end_ptr - left);
+    size_t chunk_size = right ? right - left : end_ptr - left;
 
     // check if we have enough space, including the null terminator.
     if (chunk_size + bytes_written >= PROCESSED_WORD_CAPACITY) {