*1,2,3,5,5,6*
*stdin==0:0*
*%*
*5*
*66.0*
*10*
*0*
*-10*
*18*
*10*
*0*
*4294967286*
*malloc(0) does not fail horribly (spec allows 0 or non-zero)*
tolower_l: a
*cleaned*