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Please try to avoid dependencies to third-party libraries and frameworks.
if string.sub(p, -1, -1) == "/" then p=string.sub(p, 1, -2) end
p.chomp!("/")
p = p.strip_suffix(std::path::is_separator).unwrap_or(p);
let p = if ::std::path::is_separator(p.chars().last().unwrap()) { &p[0..p.len()-1] } else { p };