Colapsing or Collapsing: How To spell?

The word Colapsing is misspelled against Collapsing, which is present continuous of "Collapse"

Collapsing has double "ll" is mispronounced as "l"
Remember double 'LL' in between the strings co & apsing which should not be misspelled with single 'L'
Wrong Spelling:  co-l-apsing 
Correct Spelling:  co-ll-apsing 
Find more incorrect spellings of Collapsing to spell right way.