Find and fix any errors in the following code fragment. The comments indicate what should have happened before, during, and by the end of the fragment were things all well and good. $($You may assume that things are perfectly set up before the fragment and continue fine there$-$after.$)$

$//$ line is a string read with getline and so may contain spaces

while $($line$.$find$("")==$ npos$)//$ found a double space

$\{$

line.erase$($line$.$find$(""))$; $//$ erase one of them

$\}$

$//$ line now only has single spaces