Category
implementation
Stamping The Sequence
Given a target string and a set of characters, the problem is to find the minimal number of times the set of characters need to be used to form the target string, and return the order in which the characters are used 
Split Message Based on Limit
Given a string and an integer limit, the problem is to split the given string into a list of strings such that the length of each string does not exceed the given limit and return the list