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10-double-char.md

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Problem:

Given a string, you have to return a string in which each character (case-sensitive) is repeated once.

double_char("String") ==> "SSttrriinngg"

double_char("Hello World") ==> "HHeelllloo  WWoorrlldd"


double_char("1234!_ ") ==> "11223344!!__  "

double_char("String") ==> "SSttrriinngg"

double_char("Hello World") ==> "HHeelllloo  WWoorrlldd"

double_char("1234!_ ") ==> "11223344!!__  "
doubleChar("String") ==> "SSttrriinngg"

doubleChar("Hello World") ==> "HHeelllloo  WWoorrlldd"

doubleChar("1234!_ ") ==> "11223344!!__  "
doubleChar "String" ==> "SSttrriinngg"

doubleChar "Hello World" ==> "HHeelllloo  WWoorrlldd"

doubleChar "1234!_ " ==> "11223344!!__  "
doubleChar "String" ==> "SSttrriinngg"

doubleChar "Hello World" ==> "HHeelllloo  WWoorrlldd"

doubleChar "1234!_ " ==> "11223344!!__  "
DoubleChar("String") == "SSttrriinngg"

DoubleChar("Hello World") == "HHeelllloo  WWoorrlldd"

DoubleChar("1234!_ ") == "11223344!!__  "

Good Luck!

Solution