Implemented the gamma function. Issue #143

[Abhik004]

I successfully integrated the gamma function into a JavaScript application. I also fixed a bug - the buttons for more function were repeated twice. I have resolved the issue and fixed the bug.

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[Abhik004]

Kindly check it and merge it if its ok @DhanushNehru

[DhanushNehru]

Please resolve merge conflicts @Abhik004

145

[Abhik004]

Please check now @DhanushNehru

[Abhik004]

I will create a new pr resolving the bug