Hackerrank Playing With Characters Solution in c Watch Video: Code:: #include < stdio.h > #include < string.h > #include < math.h > #include < stdlib.h > int main() { /* Enter your code here. Read input from STDIN. Print output to STDOUT */ //first step is to create variables char ch; //character char s[ 128 ]; //for string with maximum size i.e 128 char sen[ 128 ]; //sentence //second step for scanning scanf( "%c" ,&ch); //for charaacter scanf( "%s\n" ,&s); //for string scanf( "%[^\...