centerString -- center a string or net

• Usage:

  centerString(wid,s)

• Inputs:
  • wid, an integer
  • s, a net
• Outputs:
  • a net with spaces added, as needed, to center s in a net of width wid

i1 : centerString(18,"asdf"||"qwer")

o1 =        asdf       
            qwer