htaccess redirect help

I am having an issue with redirects.

my site is https://kortx.co but my nephew installed it all on kortx.co/platform

The main URL works using just the kortx.co but if I click on some buttons it takes me to /platform/the_old_url which is not where it needs to go.

Can I .htaccess it so that everything which is kortx.co/platform/ ignores (or redirects) the /platform/ bit?

Like this for instance
FROM
https://kortx.co/platform/my-project/

TO
https://kortx.co/my-project/

Very much appreciated if anyone can help.

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