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Splitting string with token
sscanf(mat, "%s.txt", ime_datoteke);

sscanf(mat, "%[^.].txt", ime_datoteke);

char* dot = strrchr(mat, '.');
strncpy(ime_datoteke, mat, dot - mat);

char* pch = strrchr(str,'.');

if(pch)
   *pch = '';

const char *fullstop;

if ((fullstop = strrchr(mat, '.')))
    strncpy(ime_datoteke, mat, fullstop - mat);
else
    strcpy(ime_datoteke, mat);

char a[] ="sm04567890.txt";
char *b = strstr(a, ".txt");
*b = '';
printf("%sn", a);