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It took me more than 3 nights to locate the place (in the source code) that causes this 'whitespace' problem. After that, it took me just less than a minute to fix it.
Before bugfix
After bug fixed
"trim()" is used to remove whitespace, there are three functions to use depending on the problem.
ltrim() function-[used for removing whitespace before a string]
rtrim() function-[used for removing whitespace after a string]
trim() function-[used for removing whitespace both before and after a string]