Convert number to string

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int- https://stackoverflow.com/questions/5590381/easiest-way-to-convert-int-to-string-in-c
double - https://stackoverflow.com/questions/332111/how-do-i-convert-a-double-into-a-string-in-c
ll- https://stackoverflow.com/questions/947621/how-do-i-convert-a-long-to-a-string-in-c

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