subject

Write a method that takes in a String and returns a new
string that replaces every instance of the letters k, a, r, e, l with two occurrences of
that letter.

For example.

moreKarelLetters("kaleidoscope")
would return

"kkaaleeidoscopee"
Hint : Strings have a method .contains(str) which returns a boolean
indicating if a given Strings contains another String.

This is in Java.

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