Update knuth-morris-pratt using ES6

[amansaurabh]

Description:

Current Behavior:

The current implementation of the Knuth-Morris-Pratt (KMP) algorithm is written in a mix of ES5 and older JavaScript syntax. It consists of a function that efficiently searches for the position of the first occurrence of a specified value in a string.

Proposed Changes:

I propose updating the code to use ES6 features and syntax. This includes leveraging arrow functions, template literals, and other modern JavaScript constructs to enhance readability and maintainability.

Benefits:

• Improved code readability and maintainability due to the use of modern JavaScript syntax.
• Potential performance enhancements through optimized ES6 constructs.

Additional Information:

The updated code will maintain the functionality of the KMP algorithm while utilizing ES6 features to enhance its codebase. This update aims to align the algorithm with modern JavaScript practices.

[0himanshu3]

@amansaurabh please assign the issue to me.I have written the code in es6.