Write a recursive function that tests whether a string is made up of repeated copies of the same given base string. For example, "hahahaha" has the base string "ha" repeated four times. Complete the following file: strings.cpp 1 #include 2 using namespace std; 3 4 5 Returns true if str is a repetition of the nonempty string base. 6 7 bool is_repetition_of(string str, string base) 8 9 int n = base.length(); 10 if (str.length() using namespace std; #include "util.h" 3 4 5 6 7 8 string repetition_base_helper(string str, string base) { if (is_repetition_of(str, base)) } 9 10 11 12 13 14 string repetition_base(string str) { return repetition_base_helper(str.substr(1), str.substr(0, 1)); } Submit