Algorithms for 2D to 3D conversion of rings

Dear CCLers
 Does anybody has any idea of any free source code in C
 or FORTRAN for converting connectivity table of
 structures containing rings (fused, bridged etc) to 3D
 coordinates using simple rules and without molecular
 Suman K. Chakravarti
 Chemistry Department
 Case Western Reserve University
 Cleveland, OH 44106, USA
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