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Write a function named `stringCount` that takes in an array of strings and returns an object where the keys are the strings from the array and the value of each key is a count of how many times the string appears in the object. If there are duplicate strings the values should reflect that.

Write a function named `highestFrequencyString` that takes in an array of strings and returns the string with the highest frequency in the array and how many times it appears.

1. Write a function named `highestFrequencyString` that takes in an array of strings and returns the string with the highest frequency in the array and how many times it appears.

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