[critical] walkGlob doesn't work with un-normalized paths (eg containing `//`); os.walkFiles works

[timotheecour]

the // in input pattern makes walkGlob not work; it should work, like other tools (eg: unix ls on cmdline, or os.walkFiles)

  # D20200115T205019
  import pkg/glob
  import std/os
  proc main()=
    let pattern2 = "/Users/timothee/temp//d18_D20200115T203454/*.log"
    echo "walkGlob:"
    for file in walkGlob(pattern2):
      echo (file: file)
    echo "walkFiles:"
    for file2 in walkFiles(pattern2):
      echo (file2: file2)
  main()

output:

walkGlob:
walkFiles:
(file2: "/Users/timothee/temp//d18_D20200115T203454/foo1.foo2.foo3.log")
(file2: "/Users/timothee/temp//d18_D20200115T203454/foo1.foo2.log")
(file2: "/Users/timothee/temp//d18_D20200115T203454/foo1.log")

note

double slashes can and do occur in practice, eg if user has an env var MYDIR=/path/to/foo/ and enters a path like $MYDIR/foo.txt ;
this is not uncommon practice, because ending dirs in / (eg MYDIR=/path/to/foo/ ) makes sense, and concatenating with / (eg $MYDIR/foo.txt) also makes sense in case user is not sure whether $MYDIR ended in a /
I can point to more stackoverflow issues pointing to how this does happen in practice, if needed

proposal

walkGlob shd probably simply call normalizedPath on the input pattern before further processing