Fix a bug for sort. When the key_separator is not space, the sort commandline tool fails to sort by the 3rd,4th,etc column. For example: when you exec

	  $ sort -t',' -k 3n

	on a file which cotains:

	1,2,3,4
	2,3,4,1
	4,1,2,3
	3,4,1,2

	you got:

	4,1,2,3
	1,2,3,4
	2,3,4,1
	3,4,1,2

	but the expected output should be:

	3,4,1,2
	4,1,2,3
	1,2,3,4
	2,3,4,1

The bug is due to the dependency of "isspace(str[end])" at line 113.
When searching for the non-space key_separator, the search stopped just at the position of first key_separator it met.
The bug can be easily fixed by adding "end++" when the search have found one separator and exit the for loop.

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