Language: C

#include <stdio.h>
#define MAXNUM 100001

char judge[MAXNUM] = {'\0'};
int animal[MAXNUM] = {-1};

void solve(char judge, int *animal);
int main(void)
{
    int N = 0;
    int i;

    scanf("%d", &N);
    scanf("%s", judge);

    animal[0] = 0; //S:0, W:1
    animal[N - 1] = 1;
    for (i = 0; i < N; i++)
        judge(i);
    if (animal[0] == 0 && animal[N - 1] == 1)
    {
        for (i = 0; i < N; i++)
        {
            if (animal[i])
                printf("W");
            else
                printf("S");
        }
        return 0;
    }

    animal[0] = 0; //S:0, W:1
    animal[N - 1] = 0;
    for (i = 0; i < N; i++)
        judge(i);
    if (animal[0] == 0 && animal[N - 1] == 0)
    {
        for (i = 0; i < N; i++)
        {
            if (animal[i])
                printf("W");
            else
                printf("S");
        }
        return 0;
    }

    animal[0] = 1; //S:0, W:1
    animal[N - 1] = 0;
    for (i = 0; i < N; i++)
        judge(i);
    if (animal[0] == 1 && animal[N - 1] == 0)
    {
        for (i = 0; i < N; i++)
        {
            if (animal[i])
                printf("W");
            else
                printf("S");
        }
        return 0;
    }

    animal[0] = 1; //S:0, W:1
    animal[N - 1] = 1;
    for (i = 0; i < N; i++)
        judge(i);
    if (animal[0] == 1 && animal[N - 1] == 1)
    {
        for (i = 0; i < N; i++)
        {
            if (animal[i])
                printf("W");
            else
                printf("S");
        }
        return 0;
    }

    printf("-1");
    return 0;
}

void judge(int i)
{
    if (judge[i] == 'o')
    {
        if (i == 0)
        {
            if (animal[i])
                animal[i + 1] = !animal[N - 1];
            else
                animal[i + 1] = animal[N - 1];
        }
        else if (i == N - 1)
        {
            if (animal[i])
                animal[0] = !animal[N - 2];
            else
                animal[0] = animal[N - 2];
        }
        else
        {
            if (animal[i])
                animal[i + 1] = !animal[i - 1];
            else
                animal[i + 1] = animal[i - 1];
        }
    }
    else
    {
        if (i == 0)
        {
            if (animal[i])
                animal[i + 1] = animal[N - 1];
            else
                animal[i + 1] = !animal[N - 1];
        }
        else if (i == N - 1)
        {
            if (animal[i])
                animal[0] = animal[N - 2];
            else
                animal[0] = !animal[N - 2];
        }
        else
        {
            if (animal[i])
                animal[i + 1] = animal[i - 1];
            else
                animal[i + 1] = !animal[i - 1];
        }
    }
}

Compiler output:
main.c: In function 'main':
main.c:19:9: error: called object 'judge' is not a function or function pointer
   19 |         judge(i);
      |         ^~~~~
main.c:4:6: note: declared here
    4 | char judge[MAXNUM] = {'\0'};
      |      ^~~~~
main.c:35:9: error: called object 'judge' is not a function or function pointer
   35 |         judge(i);
      |         ^~~~~
main.c:4:6: note: declared here
    4 | char judge[MAXNUM] = {'\0'};
      |      ^~~~~
main.c:51:9: error: called object 'judge' is not a function or function pointer
   51 |         judge(i);
      |         ^~~~~
main.c:4:6: note: declared here
    4 | char judge[MAXNUM] = {'\0'};
      |      ^~~~~
main.c:67:9: error: called object 'judge' is not a function or function pointer
   67 |         judge(i);
      |         ^~~~~
main.c:4:6: note: declared here
    4 | char judge[MAXNUM] = {'\0'};
      |      ^~~~~
main.c: At top level:
main.c:84:6: error: 'judge' redeclared as different kind of symbol
   84 | void judge(int i)
      |      ^~~~~
main.c:4:6: note: previous definition of 'judge' with type 'char[100001]'
    4 | char judge[MAXNUM] = {'\0'};
      |      ^~~~~
main.c: In function 'judge':
main.c:86:14: error: subscripted value is neither array nor pointer nor vector
   86 |     if (judge[i] == 'o')
      |              ^
main.c:91:41: error: 'N' undeclared (first use in this function)
   91 |                 animal[i + 1] = !animal[N - 1];
      |                                         ^
main.c:91:41: note: each undeclared identifier is reported only once for each function it appears in