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"Unget String" Function

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        As a complement to ungetc(), this C function pushes a string back onto an input stream, character by character.  It returns the number of characters pushed, or -1 if an error occurred.
void ungets(char* str, FILE* stream) {
 if (!str || !file) return -1;
 size_t len = strlen(str);
 for (int i=len-1; i>=0; i--) if (ungetc(str[i], stream) == EOF) return -1;
 return len;