Given a string, return a string where for every char in the original, there are two chars

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Bog'liq
CodingBat String 2

String-2 > doubleChar
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Given a string, return a string where for every char in the original, there are two chars.

ikkilanganBelgi

Berilgan satrning har bir belgisi ikkilangan holatdagi yangi satr qaytaring. Masalan, “PDP” “PPDDPP”;

doubleChar("The") → "TThhee"

doubleChar("AAbb") → "AAAAbbbb"
doubleChar("Hi-There") → "HHii--TThheerree"

String-2 > countHi
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Return the number of times that the string "hi" appears anywhere in the given string.

“Hi”niSana

Berilgan satrning istalgan joyida joylashgan “hi” so`zining sanog`ini qaytaring.

countHi("abc hi ho") → 1

countHi("ABChi hi") → 2
countHi("hihi") → 2

String-2 > catDog
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Return true if the string "cat" and "dog" appear the same number of times in the given string.

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