Then
A must be the swindlecant
B must be the honestant
C must be the swindlecant
A is swndlecant because his statement is false making him a swindlecant.
B is honestant because he conclude that "Just one of us in an honest man" let's say that C is the honestant then B is also an honestant because he is also telling the truth so C should not be the honestant therefore if B is the only one who is honestant then C must be a swindlecant.