strcat.c

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#include <string.h>
 
char* strcat(char* _RESTRICT s1, const char* _RESTRICT s2)
{
    char* rc = s1;
 
    if (*s1)
    {
        while (*++s1)
        {
            /* EMPTY */
        }
    }
 
    while ((*s1++ = *s2++))
    {
        /* EMPTY */
    }
 
    return rc;
}