String comparison

Question

I have a string s = 'abc xyz', then a string s1 is said to be valid if it is made up-of same alphabets as in s and all alphabets of s must be used and length of s1 can be greater or equal to s because repetition of those alphabets is allowed.
example s = 'rail safety' then 'fairy tales' and 'yes its a rail safe' both are valid.
Can u write a C program for this?

Answer 1

could you please show your attempt..