Update string.rs

[0x7FFFFFFFFFFFFFFF]

Fix typo

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.43%. Comparing base (56b6e54) to head (0654854).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1552   +/-   ##
=======================================
  Coverage   61.43%   61.43%           
=======================================
  Files          24       24           
  Lines        2951     2951           
=======================================
  Hits         1813     1813           
  Misses       1138     1138           

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[codspeed-hq]

CodSpeed Performance Report

Merging #1552 will improve performances by 10.71%

_{Comparing 0x7FFFFFFFFFFFFFFF:patch-1 (0654854) with main (56b6e54)}

Summary

⚡ 1 improvements
✅ 23 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	0x7FFFFFFFFFFFFFFF:patch-1	Change
⚡	number	287.2 ns	259.4 ns	+10.71%

[Geal]

Thanks