Duning or Dunning: How To spell?

The word Duning is misspelled against Dunning, which is present continuous of "Dun"

Dunning has double "nn" is mispronounced as "n"
Remember double 'NN' in between the strings du & ing which should not be misspelled with single 'N'
Wrong Spelling: du-n-ing
Correct Spelling: du-nn-ing
Check more misspelled words of Dunning to spell it correct.