in c language

4 Subsets and Power Sets A subset A of a set S, written ACS or AC S (the latter means that A may be equa to S), is a set whose elements must be in S. The power set of a set S, sometimes written P(S), is the set of all subsets of S. Write the following program: Input (from stdin): a set of strings (of alphanumeric characters), where set elements are separated with a space Output (to stdout): the power set of the input set, with each subset on its own line (subsets can appear in any order); separate elements in a subset with a space Makefile target name: run-hw-powerset Example: printf a b c I make -sf Makefile run-hw-powerset Output: a ab C bo (Note: there's an initial blank line, representing the empty set.) Q E