Auto merge of #8641 - weihanglo:fix/remove-alloc, r=Eh2406
fix: remove unnecessary allocations
Remove unnecessary `str::to_string` and `str::replace` allocations by using iterators. This PR is almost identical to #8622 except it does not skip the generated header.
Sorry that I did not profile the changes by myself. Seems that valgrind does not support macOS 10.15.6, I have not idea how to profile cargo subcommand. It would be great for an instruction to run a memory profiling for Rust program on macOS.
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