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Given a string, compute recursively a new string where all the adjacent chars are now separated by an underscore ("_"). So given "hello",...
X1662: allUnderscore
Given a string, compute recursively a new string where all the adjacent chars are now separated by an underscore ("_"). So given "hello", return "h_e_l_l_o".
Examples:
allUnderscore("abc") -> "a_b_c"
allUnderscore("a") -> "a"
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