string variables not highlighted

[Dario-Rosa85]

Checklist

• [x] Check that you have the GNU C Compiler installed by typing gcc --version into a terminal.
• [x] If you don't have the linter package installed, either update to the latest version of linter-gcc or install linter directly with apm install linter.
• [x] Ensure that you are using a valid grammar - either C/C++/C++14
• [x] Ensure that you have read all the relevant information in the wiki, particularly the Common Issues page.

Issue (including debugging messages):

if I declare a int or float variable, the syntax highlight the type specification with a purple color. The same does not happen for a string variable. I attach a screenshot of a simple example.