How to deal with the data submitted by the form in CGI

the front end submits data to CGI, through the form, but I found that the data format in CGI is not correct, and some data seems to have been escaped

.

as shown in the figure, PP+ should actually show spaces, and% 2C I need to show commas.

how do I escape?

C cgi web
Jun.24,2021

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b4713c-2c87b.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b4713c-2c87b.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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