Pronouncing the Xs

Create a function which replaces all the x's in the string in the following ways:

Replace all x's with "cks" UNLESS:

• The word begins with "x", therefore replace it with "z".
• The word is just the letter "x", therefore replace it with "ecks".

Examples

x_pronounce("Inside the box was a xylophone") ➞ "Inside the bocks was a zylophone"

x_pronounce("The x ray is excellent") ➞ "The ecks ray is eckscellent"

x_pronounce("OMG x box unboxing video x D") ➞ "OMG ecks bocks unbocksing video ecks D"

Notes

• All x's are lowercase.
• I know that not all words with x's follow this rule, but there are too many edge cases to count!