🐛 fix path for windows

[zakrad]

This fixes the issue when you forge build in Windows and get error[7858]

Compiler run failed
error[7858]: ParserError: Expected pragma, import directive or contract/interface/library/struct/enum/constant/function/error definition.
 --> lib/foundry-huff/lib/solidity-stringutils/strings.sol:1:1:
  |
1 | ./src/strings.sol
  | ^