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Warmup-1 > delDel
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Given a string, if the string "del" appears starting at index 1, return a string where that "del" has been deleted. Otherwise, return the string unchanged.

delDel("adelbc") → "abc"
delDel("adelHello") → "aHello"
delDel("adedbc") → "adedbc"

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public String delDel(String str) { }

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