提升内功之模拟实现库函数strlen/strncpy/strcmp/strcat/strstr/memcpy/memmove
strlenstrncpystrcmpstrcatstrstrmemcpymemmovestrlen#includesize_tStrlen(constchar*src){size_tcount=0;while(*src!='\0'){src++;count++;}returncount;}intmain(){chararr[]="abcdef";printf("%zd",Strlen(arr))