trim 空格字符剔除函数

char *ltrim(char *string){ if (string==NULL || strlen(string)==0) return string; char *p=string; while(*p==' ') p++; memmove(string,p,strlen(p)+1); return string;}char *rtrim(char *string){ if (string==NULL || strlen(string)==0) return string; char *p=string+strlen(string)-1; while(*p==' ') { *p=NULL; p--; } return string;}char *trim(char *string){ return rtrim(ltrim(string));}