SumNumbers <- function(s) { # Returns the sum of all integers in string 's'. # Hint: use the 'strsplit' function we talked about in class. Remember to index # the resulting list with [[1]] # Preconditions: # - 's' is not the empty string # - 's' contains only non-negative integers seperated by a single space. # - the first character of s is not a space; neither is the last one. # Add your code here }

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