>>505
#include<stdio.h>

void remove_last_char(char *str){
if(str==NULL || *str=='\0') return;
for(;*(str+1);str++);
*str='\0';
}
void remove_first_char(char *str){
if(str==NULL || *str=='\0') return;
for(;(*str=*(str+1));str++);
}
int count_char(const char *str, int moji){
int count;

for(count=0;*str;str++) if(*str==moji) count++;
return count;
}
int main(void){
char buf[]="Hello good-morning. Mike.";

puts(buf);
remove_last_char(buf);
puts(buf);
remove_first_char(buf);
puts(buf);
printf("%d\n", count_char(buf, 'o'));

return 0;
}