Add Remove All Whitespace in F#

[JesseChum]

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I Am Adding a New Code Snippet in an Existing Language

• [x] I fixed Add Remove All Whitespace in F# #3986
• [x] I named the pull request using Add {PROJECT} in {LANGUAGE} format

[JesseChum]

Deleted the obj directory, program.fs, and sample-problems.fsproj files.