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replacing a quote in some lines with multiple quote fields

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# 1  
Old 06-02-2010
replacing a quote in some lines with multiple quote fields

i want to replace mistaken quotes in line starting with tag 300 and relocate the quote in the correct position so the input is
300;X;Event: "419031003804486","76","2010/04/28-06-48-23.00",,,,,,,,,"9697","18744","28441",,,"4676",,,,,,,,,"blackb"e"rry."net,"419031003804486",,"1",,,, ,,
Footer: text_data_transfer_file

and i need to replace field #26 in the line starting with 300;X; from "blackb"e"rry."net to ""
so the corrected version from the previous one should be
300;X;Event: "419031003804486","76","2010/04/28-06-48-23.00",,,,,,,,,"9697","18744","28441",,,"4676",,,,,,,,,"","419031003804486",,"1",,,,,,
Footer: text_data_transfer_file
# 2  
Old 06-02-2010
awk -F","  '/^300;/ {$26=sprintf("%c%s%c", 34, "", 34)}  {print $0} '  oldfile > newfile

# 3  
Old 06-02-2010
this was OK ,
but it is not always "" , it could be other values
for example :
300;X;Event: "204043100439143","76","2010/05/31-22-58-48.00",,,,,,,,,"155","104","259",,,"281",,,,,,,,,E"MGS"M.VZW3G".COM
# 4  
Old 06-02-2010
awk -F, '/^300/ {gsub(/"/,"",$26);sub(/.*/,"\"&\"",$26);print;next;} {print;} old.file > new.file

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