Dynamic string

Hi,

My objective is create a "dynamic" string. It will initially be
allocated with 1 byte. After 1st iteration the string will contain
"foo" after second iteration it will contain "foobars" third
"foobarsbaz" so on. ie, On an interative basis the size of the string
to be increased without erasing the  contents of the string.
How do I achieve this?
I don't want to use library functions like strcat ().

Subh
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