Fix toString symbols in ERC721Facet to match decimal conversion

[CodeCryptX]

Description

The toString function in ERC721Facet.sol is intended to convert a uint256 to its decimal string representation, but it incorrectly defines _SYMBOLS as:

bytes16 _SYMBOLS = "0123456789abcdef";

The characters 'a'..'f' are never used in the decimal conversion logic, making the code misleading.

Changes Made:

• Updated _SYMBOLS to only include decimal characters:

bytes16 _SYMBOLS = "0123456789";

Reason:

• Matches function documentation (decimal conversion).
• Improves readability and adherence to Compose principles (clarity, simplicity).
• No functional change, purely a clarity/maintenance improvement.

Test Plan:

• Verified that toString continues to return correct decimal string outputs for several test values (e.g., 0, 1, 123, 987654321).
• No regressions expected since logic is unchanged.

[mudgen]

Thanks, I appreciate you finding this and making a pull request about it.
I understand what you are saying. I am not going to change this code for now