Char to leading 0

void qu0(char a[])
{ ll n,j=0,m;
  char b[10000]={'\0'}; 
 if(strlen(a)>=2&&a[0]=='0')
  {  n=strlen(a);
	for(int i=0;i<n;i++){ if(a[i]!='0'){m=i;break;}}
	 for(int i=m;i<n;i++){b[j++]=a[i];}	 
  
  memset(a,0,sizeof(a));
  for(int i=0;i<j;i++){a[i]=b[i];}
   }
}