Wrong answer in Infix to postfix coversion INPSTFIX.I tried all the test cases ,i have not get any error but on submission it is giving WA.Please help me to find out what is wrong in this code

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1

#include <stdio.h>
#include<string.h>
int function(char *,char,int,int);
int preced(char);
int main(void) {
int t;
scanf("%d",&t);
while(t>0)
{
int n;
scanf("%d",&n);
char ch[n];
scanf("%s",&ch);
char stack[n],postfix[n];
int i,tos=-1,k=0;
tos=function(stack,’#’,tos,1);
for(i=0;i<n;i++)
{
if((ch[i]>=‘A’ &&ch[i]<=‘Z’))
{
postfix[k]=ch[i];
k++;
}
else if(ch[i]==’(’)
{

             tos=function(stack,ch[i],tos,1);
         }
           
         else if(ch[i]=='^')
           tos=function(stack,ch[i],tos,1);
          else if (ch[i]==')'){
             
            while(stack[tos] != '('){
                
                postfix[k]=stack[tos];
                k++;
                tos--;
                
            }
            tos--;
          }
          else{
                  while(preced(ch[i]) <= preced(stack[tos])) {
                  postfix[k]=stack[tos];       
                      tos--;
                      k++;
                  }
                   tos=function(stack,ch[i],tos,1);
             
             
          }
           
           
     }
     while(stack[tos] != '#') {
             postfix[k]=stack[tos];
             tos--;
              k++;
             }
    for(i=0;i<k;i++)
    {
        printf("%c",postfix[i]);
    }
    printf("\n");
       
    t--;
}
return 0;

}
int function(char stack[],char ch,int tos,int p)
{
if(p==1)
{
tos++;
stack[tos]=ch;

    return tos;
}
if(p==2)
{
    tos--;
    return tos;
}

}
int preced(char ch) {
if(ch == ‘+’ || ch == ‘-’) {
return 1;
}else if(ch == ‘*’ || ch == ‘/’) {
return 2;
}else if(ch == ‘^’) {
return 3;
}else {
return 0;
}
}

2

Format your code first or send link to your submission. Use ``` symbol at start and end of code