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uinsert - Inserts a character in a string. Allegro game programming library.
#include <allegro.h> int uinsert(char *s, int index, int c);
Inserts the character `c' at the specified `index' in the string, sliding the rest of the data along to make room. If `index' is negative, it counts backward from the end of the string. Example: uinsert(text_string, 0, prefix_letter);
Returns the number of bytes by which the trailing part of the string was moved.