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Idiom #151 Remove string trailing path separator

Remove last character from string p, if this character is the file path separator of current platform.

Note that this also transforms unix root path "/" into the empty string!

import "fmt"
import "os"
import "strings"
sep := fmt.Sprintf("%c", os.PathSeparator)
p = strings.TrimSuffix(p, sep)
import "fmt"
import "path/filepath"
import "strings"
sep := fmt.Sprintf("%c", filepath.Separator)
p = strings.TrimSuffix(p, sep)
using System.IO;
p.TrimEnd(Path.DirectorySeparatorChar);
import std.string,
import std.path;
p = p.chomp(dirSeparator);
if string.sub(p, -1, -1) == "/" then
	p=string.sub(p, 1, -2)
end
SysUtils
begin
  p := ExcludeTrailingPathDelimiter(p);
end.
LazFileUtils
begin
  p := ChompPathDelim(p);
end.
use File::Spec qw();
chomp $p, File::Spec->catdir('');
import os
if p.endswith(os.sep):
    p = p[:-1]
p.chomp!("/")
let p = if ::std::path::is_separator(p.chars().last().unwrap()) {
    &p[0..p.len()-1]
} else {
    p
};
p = p.strip_suffix(std::path::is_separator).unwrap_or(p);

New implementation...
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