int largest_five_digits(char *digits)
{
int length = sizeof(digits) + 2;
int gDigits[length], i;
int max = 0, maxI, maxDigit[5];

for(i = 0; i < length; i++)
{
gDigits[i] = digits[i];
}

for(i = 0; i < length - 4; i++)
{
if(gDigits[i] > max)
{
max = gDigits[i];
maxI = i;
}
}

for(i = 0; i < length - 4; i++)
{
maxDigit[i] = gDigits[maxI + i];
}

return maxDigit; // you code here
}

Sorry for this kind of question!
I find the solution, but i can't return it.

when i tested my code i had got following error. Why?
solution.c:1:1: error: unknown type name 'y_'
y_
^
In file included from solution.c:2:
In file included from /usr/lib/llvm-8/lib/clang/8.0.1/include/stdint.h:61:
In file included from /usr/include/stdint.h:27:
/usr/include/x86_64-linux-gnu/bits/types.h:30:1: error: expected identifier or '('
typedef unsigned char __u_char;
^
2 errors generated.

I couldn't understand well your code in line 6. Please, give me some comments or explanations if you can!

when i tested my code i passed but when i tried to submit it it failed. Why?