#include using namespace std; int stringLength (const char* s) //returns the number of printable characters in s int countChars (const chan s, const char ch) //returns the number of tines the character ch is found in s int findchar(const chan* s, const char ch, const int startIndex, const int lastIndex) returns the first index where the character ch is found in s starting from startIndex (inclusive) upto lastIndex (exclusive) If ch is not found in s in the interval, it returns -1 This function must first validate both the startIndex and lastIndex That is, if lastIndex stringLength(s) or startIndex 8 it must return-1 void rotateString(char s, const int r) Rotate the characters of s by r units If re, rotate the characters of s to the left If r