Write a function to replace all instances of character c1 with character c2 and vice versa. Examples doubleSwap( "aabbccc", "a", "b") "bbaaccc" doubleSwap ("random w#rds writt&n h&r&", "#", "&") → "random w&rds writt#n h#r#" "9") doubleSwap("128 895 556 788 999", "8", →"129 985 556 799 888"

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