Tuning or Tunning: How To spell?

The word Tuning is misspelled against Tunning, which is present continuous of "Tun"

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