Can't authenticate with OAUTH for Twitter API

I am trying to authenticate with Twitter for a custom app using Drupal.

For some reason, even though I am including my OAuth credentials, I can't authenticate with the Twitter API.

Here's my code:

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[<00147b7c>] (warn_slowpath_common+0x50/0x60) from [<00147c40>] (warn_slowpath_null+0x1c/0x24)
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I am trying to get an input string by using scanf() in a function, but it keeps failing and I don't know why.

Here is part of my code.