Fixed multiple operators in Basic Calculator

[tanu-agarwal0101]

Fixes Issue🛠️

Closes #685

Description👨‍💻

Multiple operators issue fixed.

Type of change📄

• Bug fix (non-breaking change which fixes an issue)

How this has been tested✅

Tested locally.

Checklist✅

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added demonstration in the form of GIF/video file
• I am an Open Source Contributor

Screenshots/GIF📷

Before

Now

[github-actions]

Hey @tanu-agarwal0101, Welcome to the project CalcDiverse! 🎊
Thanks for your contribution! Your effort makes this project better. Keep it up! 🙌
Please wait for the PR to be reviewed. Happy Coding!! ✨

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[Rakesh9100]

The issue is solved from the UI part, but when we enter input from keyboard, the issue is not fixed. Pls see to this @tanu-agarwal0101

Make the new commits in this same PR, don't create a new PR!!

[tanu-agarwal0101]

Ok sir

[tanu-agarwal0101]

@Rakesh9100 please check now

[Rakesh9100]

Congrats on getting your PR merged to the repo under GSSOC 2k24 🥳🎉 @tanu-agarwal0101