C4. Construct a Deterministic Finite Automaton (DFA) to accept
L={s1s2.....sn | n >=1; for each i=1,2,.....n, si € {0,1}, and the number of 1's minus the number of 0's in s1s2....si is zero,one or two}
For example, the DFA should accept 11 or 1100 but not 1110.