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-7 thanks to OMᗺ
f b=letb|(u,v)=span<-span('/'/='<)b in"b="/1"++['0'|_<-u]==v1"++('0'<$u)==v
Try it online!Try it online!
A port of my Clean answer using Neil's method.
f b=let(u,v)=span('/'/=)b in"/1"++['0'|_<-u]==v
Try it online!
f b|(u,v)<-span('/'<)b="/1"++('0'<$u)==v
