Fix string indexing type warnings for UInt16 compatibility #20
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Summary
Fixed type compatibility warnings by updating string indexing operations to use UInt16 instead of Int. This addresses the breaking change where
string[i]now returns UInt16 instead of Int.Changes
Why These Changes Were Made
The MoonBit language introduced a breaking change where string indexing operations (
string[i]) now returnUInt16instead ofInt. This caused type warnings throughout the codebase. The minimal changes ensure:moon checkpasses without warningsImplementation Details
The fixes involve simple type conversions and annotations to align with the new string indexing behavior. These are minimal, targeted changes that address the core type compatibility issue without affecting the overall functionality of the pretty printer.